v3.26.1
Fees and Expenses
May 01, 2026
Conservative Allocation Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below. Actual expenses may be greater or less than those shown. The expenses do not reflect any expenses, fees or charges paid under your variable contract or retirement plan. If these expenses, fees or charges were included, your costs would be higher.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] Total annual fund operating expenses for the year ended December 31, 2025 do not correlate to the ratio of expenses to average net assets provided in the financial highlights section of the prospectus, which reflects only the operating expenses of the Fund and does not include acquired fund fees and expenses.
Shareholder Fees Caption [Optional Text] Shareholder Fees: (fees paid directly from your investment)
Shareholder Fees [Table]

Shareholder Fees:  

(fees paid directly from your investment) 

 Class I Class II
Maximum Sales Charge Imposed on Purchases (as a percentage of offering price) None None
Maximum Deferred Sales Charge (as a percentage of amount redeemed) None None
Redemption Fee Within 30 days of Purchase (as a percentage of amount redeemed) None None
Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses: (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

Annual Fund Operating Expenses:  

(expenses that you pay each year as a percentage of the value of your investment) 

 Class I Class II
Management Fees 0.30 % 0.30 %
Distribution and/or Service (Rule 12b-1) Fees None 0.25 %
Other Expenses 0.02 % 0.02 %
Acquired Fund Fees and Expenses1 0.26 % 0.26 %
Total Annual Fund Operating Expenses2 0.58 % 0.83 %

1Fees and expenses incurred indirectly by the Fund as a result of investing in the shares of one or more underlying funds. 

2Total annual fund operating expenses for the year ended December 31, 2025 do not correlate to the ratio of expenses to average net assets provided in the financial highlights section of the prospectus, which reflects only the operating expenses of the Fund and does not include acquired fund fees and expenses.
Expense Example [Heading] Example:
Expense Example Narrative [Text Block] The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] The example assumes you invest $10,000 in the Fund for the time periods indicated and then hold or redeem all of your shares at the end of the periods. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Expense Example, With Redemption [Table]
  1 Year 3 Years 5 Years 10 Years
Class I $59 $186 $324 $726
Class II 85 265 460 1,025
Expense Example Closing [Text Block]

The example does not reflect any expenses, fees or charges paid under your variable contract or retirement plan. If these expenses, fees or charges were included, your costs would be higher.
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block]

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in total annual Fund operating expenses or in the expense examples above, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 28% of the average value of its portfolio.
Portfolio Turnover, Rate 28.00%
Moderate Allocation Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below. Actual expenses may be greater or less than those shown. The expenses do not reflect any expenses, fees or charges paid under your variable contract or retirement plan. If these expenses, fees or charges were included, your costs would be higher.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] Total annual fund operating expenses for the year ended December 31, 2025 do not correlate to the ratio of expenses to average net assets provided in the financial highlights section of the prospectus, which reflects only the operating expenses of the Fund and does not include acquired fund fees and expenses.
Shareholder Fees Caption [Optional Text] Shareholder Fees: (fees paid directly from your investment)
Shareholder Fees [Table]

Shareholder Fees:  

(fees paid directly from your investment) 

 Class I Class II
Maximum Sales Charge Imposed on Purchases (as a percentage of offering price) None None
Maximum Deferred Sales Charge (as a percentage of amount redeemed) None None
Redemption Fee Within 30 days of Purchase (as a percentage of amount redeemed) None None
Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses: (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

Annual Fund Operating Expenses:  

(expenses that you pay each year as a percentage of the value of your investment)

 Class I Class II
Management Fees 0.30 % 0.30 %
Distribution and/or Service (Rule 12b-1) Fees None 0.25 %
Other Expenses 0.02 % 0.02 %
Acquired Fund Fees and Expenses1 0.28 % 0.28 %
Total Annual Fund Operating Expenses2 0.60 % 0.85 %

1Fees and expenses incurred indirectly by the Fund as a result of investing in the shares of one or more underlying funds. 

2Total annual fund operating expenses for the year ended December 31, 2025 do not correlate to the ratio of expenses to average net assets provided in the financial highlights section of the prospectus, which reflects only the operating expenses of the Fund and does not include acquired fund fees and expenses.
Expense Example [Heading] Example:
Expense Example Narrative [Text Block] The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] The example assumes you invest $10,000 in the Fund for the time periods indicated and then hold or redeem all of your shares at the end of the periods. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Expense Example, With Redemption [Table]
  1 Year 3 Years 5 Years 10 Years
Class I $61 $192 $335 $750
Class II 87 271 471 1,049
Expense Example Closing [Text Block]

The example does not reflect any expenses, fees or charges paid under your variable contract or retirement plan. If these expenses, fees or charges were included, your costs would be higher.
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block]

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in total annual Fund operating expenses or in the expense examples above, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 32% of the average value of its portfolio.
Portfolio Turnover, Rate 32.00%
Aggressive Allocation Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below. Actual expenses may be greater or less than those shown. The expenses do not reflect any expenses, fees or charges paid under your variable contract or retirement plan. If these expenses, fees or charges were included, your costs would be higher.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] Total annual fund operating expenses for the year ended December 31, 2025 do not correlate to the ratio of expenses to average net assets provided in the financial highlights section of the prospectus, which reflects only the operating expenses of the Fund and does not include acquired fund fees and expenses.
Shareholder Fees Caption [Optional Text] Shareholder Fees: (fees paid directly from your investment)
Shareholder Fees [Table]

Shareholder Fees: 

(fees paid directly from your investment) 

 Class I Class II
Maximum Sales Charge Imposed on Purchases (as a percentage of offering price) None None
Maximum Deferred Sales Charge (as a percentage of amount redeemed) None None
Redemption Fee Within 30 days of Purchase (as a percentage of amount redeemed) None None
Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses: (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

Annual Fund Operating Expenses:  

(expenses that you pay each year as a percentage of the value of your investment) 

 Class I Class II
Management Fees 0.30 % 0.30 %
Distribution and/or Service (Rule 12b-1) Fees None 0.25 %
Other Expenses 0.02 % 0.02 %
Acquired Fund Fees and Expenses1 0.27 % 0.27 %
Total Annual Fund Operating Expenses2 0.59 % 0.84 %
1Fees and expenses incurred indirectly by the Fund as a result of investing in the shares of one or more underlying funds.
2Total annual fund operating expenses for the year ended December 31, 2025 do not correlate to the ratio of expenses to average net assets provided in the financial highlights section of the prospectus, which reflects only the operating expenses of the Fund and does not include acquired fund fees and expenses.
Expense Example [Heading] Example: 
Expense Example Narrative [Text Block] The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] The example assumes you invest $10,000 in the Fund for the time periods indicated and then hold or redeem all of your shares at the end of the periods. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Expense Example, With Redemption [Table]
  1 Year 3 Years 5 Years 10 Years
Class I $60 $189 $329 $738
Class II 86 268 466 1,037
Expense Example Closing [Text Block]

The example does not reflect any expenses, fees or charges paid under your variable contract or retirement plan. If these expenses, fees or charges were included, your costs would be higher.
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block]

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in total annual Fund operating expenses or in the expense examples above, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 34% of the average value of its portfolio.
Portfolio Turnover, Rate 34.00%
Diversified Income Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below. Actual expenses may be greater or less than those shown. The expenses do not reflect any expenses, fees or charges paid under your variable contract or retirement plan. If these expenses, fees or charges were included, your costs would be higher.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] Total annual fund operating expenses for the year ended December 31, 2025 do not correlate to the ratio of expenses to average net assets provided in the financial highlights section of the prospectus, which reflects only the operating expenses of the Fund and does not include acquired fund fees and expenses.
Shareholder Fees Caption [Optional Text] Shareholder Fees: (fees paid directly from your investment)
Shareholder Fees [Table]

Shareholder Fees:  

(fees paid directly from your investment) 

 Class I Class II
Maximum Sales Charge Imposed on Purchases (as a percentage of offering price) None None
Maximum Deferred Sales Charge (as a percentage of amount redeemed) None None
Redemption Fee Within 30 days of Purchase (as a percentage of amount redeemed) None None
Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses: (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

Annual Fund Operating Expenses: 

(expenses that you pay each year as a percentage of the value of your investment) 

 Class I Class II
Management Fees 0.25% 0.25%
Distribution and/or Service (Rule 12b-1) Fees None 0.25%
Other Expenses 0.02% 0.02%
Acquired Fund Fees and Expenses1 0.44% 0.44%
Total Annual Fund Operating Expenses2 0.71% 0.96%
1Fees and expenses expected to be incurred indirectly by the Fund in the current fiscal year as a result of investing in shares of one or more underlying funds.
2Total annual fund operating expenses for the year ended December 31, 2025 do not correlate to the ratio of expenses to average net assets provided in the financial highlights section of the prospectus, which reflects only the operating expenses of the Fund and does not include acquired fund fees and expenses.
Expense Example [Heading] Example:
Expense Example Narrative [Text Block] The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] The example assumes you invest $10,000 in the Fund for the time periods indicated and then hold or redeem all of your shares at the end of the periods. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Expense Example, With Redemption [Table]
  1 Year 3 Years 5 Years 10 Years
Class I $73 $227 $395 $883
Class II 98 306 531 1,178
Expense Example Closing [Text Block]

The example does not reflect any expenses, fees or charges paid under your variable contract or retirement plan. If these expenses, fees or charges were included, your costs would be higher.
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block]

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in total annual Fund operating expenses or in the expense examples above, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 20% of the average value of its portfolio.
Portfolio Turnover, Rate 20.00%
Core Bond Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below. Actual expenses may be greater or less than those shown. The expenses do not reflect any expenses, fees or charges paid under your variable contract or retirement plan. If these expenses, fees or charges were included, your costs would be higher.
Shareholder Fees Caption [Optional Text] Shareholder Fees: (fees paid directly from your investment)
Shareholder Fees [Table]

Shareholder Fees:  

(fees paid directly from your investment) 

 Class I Class II
Maximum Sales Charge Imposed on Purchases (as a percentage of offering price) None None
Maximum Deferred Sales Charge (as a percentage of amount redeemed) None None
Redemption Fee Within 30 days of Purchase (as a percentage of amount redeemed) None None
Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses: (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

Annual Fund Operating Expenses:  

(expenses that you pay each year as a percentage of the value of your investment) 

 Class I Class II
Management Fees 0.55% 0.55%
Distribution and/or Service (Rule 12b-1) Fees None 0.25%
Other Expenses 0.03% 0.03%
Total Annual Fund Operating Expenses 0.58% 0.83%
Expense Example [Heading] Example:
Expense Example Narrative [Text Block] The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] The example assumes you invest $10,000 in the Fund for the time periods indicated and then hold or redeem all of your shares at the end of the periods. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Expense Example, With Redemption [Table]
  1 Year 3 Years 5 Years 10 Years
Class I $59 $186 $324 $726
Class II 85 265 460 1,025
Expense Example Closing [Text Block]

The example does not reflect any expenses, fees or charges paid under your variable contract or retirement plan. If these expenses, fees or charges were included, your costs would be higher.
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block]

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in total annual Fund operating expenses or in the expense examples above, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 13% of the average value of its portfolio.
Portfolio Turnover, Rate 13.00%
Large Cap Value Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below. Actual expenses may be greater or less than those shown. The expenses do not reflect any expenses, fees or charges paid under your variable contract or retirement plan. If these expenses, fees or charges were included, your costs would be higher.
Shareholder Fees Caption [Optional Text] Shareholder Fees: (fees paid directly from your investment)
Shareholder Fees [Table]

Shareholder Fees:  

(fees paid directly from your investment) 

 Class I Class II
Maximum Sales Charge Imposed on Purchases (as a percentage of offering price) None None
Maximum Deferred Sales Charge (as a percentage of amount redeemed) None None
Redemption Fee Within 30 days of Purchase (as a percentage of amount redeemed) None None
Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses: (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

Annual Fund Operating Expenses:  

(expenses that you pay each year as a percentage of the value of your investment) 

 Class I Class II
Management Fees 0.60% 0.60%
Distribution and/or Service (Rule 12b-1) Fees None 0.25%
Other Expenses 0.02% 0.02%
Total Annual Fund Operating Expenses 0.62% 0.87%
Expense Example [Heading] Example:
Expense Example Narrative [Text Block] The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] The example assumes you invest $10,000 in the Fund for the time periods indicated and then hold or redeem all of your shares at the end of the periods. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Expense Example, With Redemption [Table]
  1 Year 3 Years 5 Years 10 Years
Class I $63 $199 $346 $774
Class II 89 278 482 1,073
Expense Example Closing [Text Block]

The example does not reflect any expenses, fees or charges paid under your variable contract or retirement plan. If these expenses, fees or charges were included, your costs would be higher.
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block]

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in total annual Fund operating expenses or in the expense examples above, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 24% of the average value of its portfolio.
Portfolio Turnover, Rate 24.00%
Large Cap Growth Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below. Actual expenses may be greater or less than those shown. The expenses do not reflect any expenses, fees or charges paid under your variable contract or retirement plan. If these expenses, fees or charges were included, your costs would be higher.
Shareholder Fees Caption [Optional Text] Shareholder Fees: (fees paid directly from your investment)
Shareholder Fees [Table]

Shareholder Fees:  

(fees paid directly from your investment) 

 Class I Class II
Maximum Sales Charge Imposed on Purchases (as a percentage of offering price) None None
Maximum Deferred Sales Charge (as a percentage of amount redeemed) None None
Redemption Fee Within 30 days of Purchase (as a percentage of amount redeemed) None None
Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses:(expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

Annual Fund Operating Expenses: 

(expenses that you pay each year as a percentage of the value of your investment) 

 Class I Class II
Management Fees 0.80% 0.80%
Distribution and/or Service (Rule 12b-1) Fees None 0.25%
Other Expenses 0.03% 0.03%
Total Annual Fund Operating Expenses 0.83% 1.08%
Expense Example [Heading] Example:
Expense Example Narrative [Text Block] The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual Funds.
Expense Example by, Year, Caption [Text] The example assumes you invest $10,000 in the Fund for the time periods indicated and then hold or redeem all of your shares at the end of the periods. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Expense Example, With Redemption [Table]
  1 Year 3 Years 5 Years 10 Years
Class I $85 $265 $460 $1,025
Class II 110 343 595 1,317
Expense Example Closing [Text Block]

The example does not reflect any expenses, fees or charges paid under your variable contract or retirement plan. If these expenses, fees or charges were included, your costs would be higher.
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block]

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in total annual Fund operating expenses or in the expense examples above, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 23% of the average value of its portfolio.
Portfolio Turnover, Rate 23.00%
Mid Cap Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below. Actual expenses may be greater or less than those shown. The expenses do not reflect any expenses, fees or charges paid under your variable contract or retirement plan. If these expenses, fees or charges were included, your costs would be higher.
Shareholder Fees Caption [Optional Text] Shareholder Fees: (fees paid directly from your investment)
Shareholder Fees [Table]

Shareholder Fees:  

(fees paid directly from your investment) 

 Class I Class II
Maximum Sales Charge Imposed on Purchases (as a percentage of offering price) None None
Maximum Deferred Sales Charge (as a percentage of amount redeemed) None None
Redemption Fee Within 30 days of Purchase (as a percentage of amount redeemed) None None
Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses: (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses [Table]

Annual Fund Operating Expenses:  

(expenses that you pay each year as a percentage of the value of your investment) 

 Class I Class II
Management Fees 0.90% 0.90%
Distribution and/or Service (Rule 12b-1) Fees None 0.25%
Other Expenses 0.03% 0.03%
Total Annual Fund Operating Expenses 0.93% 1.18%
Expense Example [Heading] Example:
Expense Example Narrative [Text Block] The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual Funds.
Expense Example by, Year, Caption [Text] The example assumes you invest $10,000 in the Fund for the time periods indicated and then hold or redeem all of your shares at the end of the periods. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Expense Example, With Redemption [Table]
  1 Year 3 Years 5 Years 10 Years
Class I $95 $296 $515 $1,143
Class II 120 375 649 1,432
Expense Example Closing [Text Block]

The example does not reflect any expenses, fees or charges paid under your variable contract or retirement plan. If these expenses, fees or charges were included, your costs would be higher.
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block]

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in total annual Fund operating expenses or in the expense examples above, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 19% of the average value of its portfolio.
Portfolio Turnover, Rate 19.00%
Madison Target Retirement 2020 Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below. Actual expenses may be greater or less than those shown. The expenses do not reflect any expenses, fees or charges paid under your variable contract or retirement plan. If these expenses, fees or charges were included, your costs would be higher.
Shareholder Fees Caption [Optional Text] Shareholder Fees:   (fees paid directly from your investment) 
Shareholder Fees [Table]

Shareholder Fees:  
(fees paid directly from your investment) 

 Class I
Maximum Sales Charge Imposed on Purchases (as a percentage of offering price) None
Maximum Deferred Sales Charge (as a percentage of amount redeemed) None
Redemption Fee Within 30 days of Purchase (as a percentage of amount redeemed) None
Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses:   (expenses that you pay each year as a percentage of the value of your investment) 
Annual Fund Operating Expenses [Table]

Annual Fund Operating Expenses:  
(expenses that you pay each year as a percentage of the value of your investment) 

 Class I
Management Fees 0.25%
Distribution and/or Service (Rule 12b-1) Fees None
Other Expenses 0.06%
Acquired Fund Fees and Expenses1 0.16%
Total Annual Fund Operating Expenses2 0.47%

Fees and expenses incurred indirectly by the Fund as a result of investing in the shares of one or more underlying funds.

1 Fees and expenses incurred indirectly by the Fund as a result of investing in the shares of one or more underlying funds. 

2 Total annual fund operating expenses for the year ended December 31, 2025 do not correlate to the ratio of expenses to average net assets provided in the financial highlights section of the prospectus, which reflects only the operating expenses of the Fund and does not include acquired fund fees and expenses.
Expense Example [Heading] Example:
Expense Example Narrative [Text Block] The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] The example assumes you invest $10,000 in the Fund for the time periods indicated and then hold or redeem all of your shares at the end of the periods. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Expense Example, With Redemption [Table]
  1 Year 3 Years 5 Years 10 Years
Class I $48 $151 $263 $591
Expense Example Closing [Text Block]

The example does not reflect any expenses, fees or charges paid under your variable contract or retirement plan. If these expenses, fees or charges were included, your costs would be higher.
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block]

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in total annual Fund operating expenses or in the expense examples above, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 19% of the average value of its portfolio.
Portfolio Turnover, Rate 19.00%
Madison Target Retirement 2030 Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below. Actual expenses may be greater or less than those shown. The expenses do not reflect any expenses, fees or charges paid under your variable contract or retirement plan. If these expenses, fees or charges were included, your costs would be higher.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] Total annual fund operating expenses for the year ended December 31, 2025 do not correlate to the ratio of expenses to average net assets provided in the financial highlights section of the prospectus, which reflects only the operating expenses of the Fund and does not include acquired fund fees and expenses.
Shareholder Fees Caption [Optional Text] Shareholder Fees:  (fees paid directly from your investment) 
Shareholder Fees [Table]

Shareholder Fees: 
(fees paid directly from your investment) 

 Class I
Maximum Sales Charge Imposed on Purchases (as a percentage of offering price) None
Maximum Deferred Sales Charge (as a percentage of amount redeemed) None
Redemption Fee Within 30 days of Purchase (as a percentage of amount redeemed) None
Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses:   (expenses that you pay each year as a percentage of the value of your investment) 
Annual Fund Operating Expenses [Table]

Annual Fund Operating Expenses:  
(expenses that you pay each year as a percentage of the value of your investment) 

 Class I
Management Fees 0.25%
Distribution and/or Service (Rule 12b-1) Fees None
Other Expenses 0.06%
Acquired Fund Fees and Expenses1 0.16%
Total Annual Fund Operating Expenses2 0.47%

1 Fees and expenses incurred indirectly by the Fund as a result of investing in the shares of one or more underlying funds. 

2 Total annual fund operating expenses for the year ended December 31, 2025 do not correlate to the ratio of expenses to average net assets provided in the financial highlights section of the prospectus, which reflects only the operating expenses of the Fund and does not include acquired fund fees and expenses.
Expense Example [Heading] Example:
Expense Example Narrative [Text Block] The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] The example assumes you invest $10,000 in the Fund for the time periods indicated and then hold or redeem all of your shares at the end of the periods. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Expense Example, With Redemption [Table]
  1 Year 3 Years 5 Years 10 Years
Class I $48 $151 $263 $591
Expense Example Closing [Text Block]

The example does not reflect any expenses, fees or charges paid under your variable contract or retirement plan. If these expenses, fees or charges were included, your costs would be higher.
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block]

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in total annual Fund operating expenses or in the expense examples above, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 31% of the average value of its portfolio.
Portfolio Turnover, Rate 31.00%
Madison Target Retirement 2040 Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below. Actual expenses may be greater or less than those shown. The expenses do not reflect any expenses, fees or charges paid under your variable contract or retirement plan. If these expenses, fees or charges were included, your costs would be higher.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] Total annual fund operating expenses for the year ended December 31, 2025 do not correlate to the ratio of expenses to average net assets provided in the financial highlights section of the prospectus, which reflects only the operating expenses of the Fund and does not include acquired fund fees and expenses.
Shareholder Fees Caption [Optional Text] Shareholder Fees: (fees paid directly from your investment)
Shareholder Fees [Table]

Shareholder Fees:  

(fees paid directly from your investment) 

 Class I
Maximum Sales Charge Imposed on Purchases (as a percentage of offering price) None
Maximum Deferred Sales Charge (as a percentage of amount redeemed) None
Redemption Fee Within 30 days of Purchase (as a percentage of amount redeemed) None
Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses:  (expenses that you pay each year as a percentage of the value of your investment) 
Annual Fund Operating Expenses [Table]

Annual Fund Operating Expenses:
 (expenses that you pay each year as a percentage of the value of your investment) 

 Class I
Management Fees 0.25%
Distribution and/or Service (Rule 12b-1) Fees None
Other Expenses 0.06%
Acquired Fund Fees and Expenses1 0.18%
Total Annual Fund Operating Expenses2 0.49%

1 Fees and expenses incurred indirectly by the Fund as a result of investing in the shares of one or more underlying funds. 

2 Total annual fund operating expenses for the year ended December 31, 2025 do not correlate to the ratio of expenses to average net assets provided in the financial highlights section of the prospectus, which reflects only the operating expenses of the Fund and does not include acquired fund fees and expenses.
Expense Example [Heading] Example:
Expense Example Narrative [Text Block] The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] The example assumes you invest $10,000 in the Fund for the time periods indicated and then hold or redeem all of your shares at the end of the periods. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Expense Example, With Redemption [Table]
  1 Year 3 Years 5 Years 10 Years
Class I $50 $157 $274 $616
Expense Example Closing [Text Block]

The example does not reflect any expenses, fees or charges paid under your variable contract or retirement plan. If these expenses, fees or charges were included, your costs would be higher.
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block]

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in total annual Fund operating expenses or in the expense examples above, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 35% of the average value of its portfolio.
Portfolio Turnover, Rate 35.00%
Madison Target Retirement 2050 Fund  
Prospectus [Line Items]  
Expense Heading [Optional Text] Fees and Expenses
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below. Actual expenses may be greater or less than those shown. The expenses do not reflect any expenses, fees or charges paid under your variable contract or retirement plan. If these expenses, fees or charges were included, your costs would be higher.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] Total annual Fund operating expenses for the year ended December 31, 2025 do not correlate to the ratio of expenses to average net assets provided in the financial highlights section of the prospectus, which reflects only the operating expenses of the Fund and does not include acquired fund fees and expenses.
Shareholder Fees Caption [Optional Text] Shareholder Fees:  (fees paid directly from your investment) 
Shareholder Fees [Table]

Shareholder Fees: 
(fees paid directly from your investment) 

 Class I
Maximum Sales Charge Imposed on Purchases (as a percentage of offering price) None
Maximum Deferred Sales Charge (as a percentage of amount redeemed) None
Redemption Fee Within 30 days of Purchase (as a percentage of amount redeemed) None
Operating Expenses Caption [Optional Text] Annual Fund Operating Expenses:  (expenses that you pay each year as a percentage of the value of your investment) 
Annual Fund Operating Expenses [Table]

Annual Fund Operating Expenses:
 (expenses that you pay each year as a percentage of the value of your investment) 

 Class I
Management Fees 0.25%
Distribution and/or Service (Rule 12b-1) Fees None
Other Expenses 0.06%
Acquired Fund Fees and Expenses1 0.19%
Total Annual Fund Operating Expenses2 0.50%

1 Fees and expenses incurred indirectly by the Fund as a result of investing in the shares of one or more underlying funds. 

2 Total annual Fund operating expenses for the year ended December 31, 2025 do not correlate to the ratio of expenses to average net assets provided in the financial highlights section of the prospectus, which reflects only the operating expenses of the Fund and does not include acquired fund fees and expenses.
Expense Example [Heading] Example:
Expense Example Narrative [Text Block] The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.
Expense Example by, Year, Caption [Text] The example assumes you invest $10,000 in the Fund for the time periods indicated and then hold or redeem all of your shares at the end of the periods. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Expense Example, With Redemption [Table]
  1 Year 3 Years 5 Years 10 Years
Class I $51 $160 $280 $628
Expense Example Closing [Text Block]

The example does not reflect any expenses, fees or charges paid under your variable contract or retirement plan. If these expenses, fees or charges were included, your costs would be higher.
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block]

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in total annual Fund operating expenses or in the expense examples above, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 42% of the average value of its portfolio.
Portfolio Turnover, Rate 42.00%