v3.26.1
Pay vs Performance Disclosure
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2025
Oct. 01, 2025
Dec. 31, 2025
USD ($)
$ / shares
Dec. 31, 2024
USD ($)
$ / shares
Dec. 31, 2023
USD ($)
$ / shares
Dec. 31, 2022
USD ($)
$ / shares
Dec. 31, 2021
USD ($)
$ / shares
Pay vs Performance Disclosure              
Pay vs Performance Disclosure, Table    
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Average SCT
Total for
Non-PEO
NEOs(3)
($)
(d)
 ​ ​ ​ ​ ​ ​ ​ ​
Value of initial fixed $100
investment based on:
​ ​ ​ ​ ​ ​ ​ ​
Company-
Selected
Measure:
Ameren
Adjusted
(Non-GAAP)
Annual
Earnings
Per Share(8)
($)
(i)
 ​
Year
(a) 		​ ​
SCT Total for
PEO
(Birk/Lyons)(1)
($)
(b)
 ​ ​
CAP to PEO
(Birk/Lyons)(4)
($)
(c)
 ​ ​
SCT Total
for PEO
(Moehn)(2)
($)
(b)
 ​ ​
CAP to
PEO
(Moehn)(4)
($)
(c)
 ​ ​
Average CAP
to Non-PEO
NEOs(5)
($)
(e)
 ​ ​
Cumulative
TSR
($)
(f)
 ​ ​
Peer Group
Cumulative
TSR(6)
($)
(g)
 ​ ​
Net Income(7)
(in millions)
$
(h)
 ​
2025 ​ ​ ​ ​ 2,860,218 ​ ​ ​ ​ ​ 813,989 ​ ​ ​ ​ ​ 6,383,194 ​ ​ ​ ​ ​ 9,094,715 ​ ​ ​ ​ ​ 5,279,317 ​ ​ ​ ​ ​ 5,675,669 ​ ​ ​ ​ ​ N/A ​ ​ ​ ​ ​ N/A ​ ​ ​ ​ ​ 747 ​ ​ ​ ​ ​ 5.03 ​ ​
2024 ​ ​ ​ ​ 2,973,817 ​ ​ ​ ​ ​ 4,808,411 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 4,933,199 ​ ​ ​ ​ ​ 9,345,357 ​ ​ ​ ​ ​ N/A ​ ​ ​ ​ ​ N/A ​ ​ ​ ​ ​ 559 ​ ​ ​ ​ ​ 4.63 ​ ​
2023 ​ ​ ​ ​ 2,892,627 ​ ​ ​ ​ ​ 1,269,859 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 6,033,703 ​ ​ ​ ​ ​ 2,478,194 ​ ​ ​ ​ ​ N/A ​ ​ ​ ​ ​ N/A ​ ​ ​ ​ ​ 545 ​ ​ ​ ​ ​ 4.38 ​ ​
2022 ​ ​ ​ ​ 2,376,562 ​ ​ ​ ​ ​ 2,614,438 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 5,100,902 ​ ​ ​ ​ ​ 6,083,692 ​ ​ ​ ​ ​ N/A ​ ​ ​ ​ ​ N/A ​ ​ ​ ​ ​ 562 ​ ​ ​ ​ ​ 4.14 ​ ​
2021 ​ ​ ​ ​ 4,305,713 ​ ​ ​ ​ ​ 5,977,831 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 4,578,798 ​ ​ ​ ​ ​ 6,226,159 ​ ​ ​ ​ ​ N/A ​ ​ ​ ​ ​ N/A ​ ​ ​ ​ ​ 518 ​ ​ ​ ​ ​ 3.84 ​ ​
​
(1)
Mr. Birk served as the PEO during 2022, 2023, 2024, and through October 2, 2025, when he retired. Mr. Lyons served as the PEO in 2021.
​
(2)
Effective with Mr. Birk’s retirement, Mr. Moehn began serving as the PEO effective October 2, 2025.
​
(3)
The non-PEO NEOs for the applicable periods are: Mr. Lyons (2022-2025), Mr. Moehn (2021-October 2, 2025), Mr. Warner L. Baxter (2021-2022), Ms. Chonda J. Nwamu (2021-2024), Mr. Diya (2021; 2023-2025), Mr. Lindgren (2025), and Ms. Shaw (2025).
​
(4)
To calculate CAP for the PEOs, as reported in column (c), the following amounts were deducted from and added to the PEO’s total compensation, as reported in the SCT:
​
​ ​ ​
2025
 ​ ​
2025
 ​
​ ​ ​
PEO #1 (Birk)
​ ​
PEO #2 (Moehn)
​
SCT Total for PEO ​ ​ ​ ​ 2,860,218 ​ ​ ​ ​ ​ 6,383,194 ​ ​
Deductions from SCT: ​ ​ ​ ​ ​ ​ ​ ​
Grant Date Fair Value of Equity-Based Awards Granted in Year (as Reported in Column (e) 
of the SCT) 		​ ​ ​ ​ (1,883,848) ​ ​ ​ ​ ​ (3,491,892) ​ ​
Change in Pension Value (as included in column (g) of the SCT) ​ ​ ​ ​ (255,640) ​ ​ ​ ​ ​ (236,925) ​ ​
Additions to SCT: ​ ​ ​ ​ ​ ​ ​ ​
Fair Value at Year-end of Unvested Awards Granted in Year(9) ​ ​ ​ ​ 456,345 ​ ​ ​ ​ ​ 3,370,918 ​ ​
Change in Fair Value of Awards Granted in Prior Years that Vested during the Year(8) ​ ​ ​ ​ 165,201 ​ ​ ​ ​ ​ 422,337 ​ ​
Change in Fair Value of Unvested Awards Granted in Prior Years that Remain Unvested and Outstanding at Year-End(8) ​ ​ ​ ​ 432,917 ​ ​ ​ ​ ​ 2,461,320 ​ ​
Fair Value of Prior Year Awards Forfeited During the Year ​ ​ ​ ​ (1,020,037) ​ ​ ​ ​ ​ — ​ ​
Service Cost for all Defined Benefit Pension Plans ​ ​ ​ ​ 58,833 ​ ​ ​ ​ ​ 185,763 ​ ​
Compensation Actually Paid to PEO(10) ​ ​ ​ ​ 813,989 ​ ​ ​ ​ ​ 9,094,715 ​ ​
(5)
To calculate Average CAP for the other NEOs, as reported in column (e), the following amounts were deducted from and added to the NEOs’ total compensation, as reported in the SCT:
​
​ ​ ​
2025
 ​
Average SCT Total Compensation for Non-PEO NEOs ​ ​ ​ ​ 5,279,317 ​ ​
Deductions from SCT: ​ ​ ​ ​ ​ ​ ​
Grant Date Fair Value of Equity-Based Awards Granted in Year (as Reported in Column (e) of the SCT) ​ ​ ​ ​ (2,820,446) ​ ​
Change in Pension Value (as included in column (g) of the SCT) ​ ​ ​ ​ (241,090) ​ ​
Additions to SCT: ​ ​ ​ ​ ​ ​ ​
Fair Value at Year-end of Unvested Awards Granted in Year(9) ​ ​ ​ ​ 2,407,503 ​ ​
Change in Fair Value of Awards Granted in Prior Years that Vested during the Year(9) ​ ​ ​ ​ 228,235 ​ ​
Change in Fair Value of Unvested Awards Granted in Prior Years that Remain Unvested and Outstanding at Year-End(9) ​ ​ ​ ​ 978,480 ​ ​
Fair Value of Prior Year Awards Forfeited During the Year ​ ​ ​ ​ (285,724) ​ ​
Service Cost for all Defined Benefit Pension Plans ​ ​ ​ ​ 129,394 ​ ​
Average Compensation Actually Paid to Non-PEO NEOs(10) ​ ​ ​ ​ 5,675,669 ​ ​
​
(6)
The Company does not have publicly traded shares of common stock and, as a result, does not have a “total shareholder return”. As a result no cumulative total shareholder return or peer group cumulative total shareholder return has been included in this table.
​
(7)
Value reported is the Company’s net income attributable to Ameren common shareholders, as reported in the Company’s Annual Report on Form 10-K for the applicable period.
​
(8)
Our named executive officers are compensated by Ameren in accordance with its executive compensation policies. The Company does not make independent decisions regarding the compensation of its executive officers. As a result, the company-selected measure included in this table is Ameren’s adjusted (non-GAAP) diluted EPS for the respective year, which reflects the financial performance measure that in Ameren’s assessment represents the most important financial measure used to link compensation actually paid for the most recently completed fiscal year to company performance. Except for 2024 and 2025, values reported represent Ameren’s GAAP diluted EPS and adjusted (non-GAAP) diluted EPS. See Appendix A for a reconciliation of GAAP to adjusted (non-GAAP) EPS for 2024 and 2025.
​
(9)
The below table provides the valuation assumptions used in determining the fair value of equity awards (on the respective valuation dates) that are materially different from those originally disclosed as of the grant date of such equity awards.
​
Performance Period
​ ​
Valuation Date
 ​ ​
Risk-Free Rate
 ​ ​
Ameren’s Common
Stock Volatility
 ​ ​
Volatility Range for the
Peer Group
 ​
2025 – 2027
 ​ ​
12/31/2025
​ ​
3.47%
​ ​
17.19%
​ ​
16.30% – 25.64%
​
2024 – 2026
 ​ ​
12/31/2024
​ ​
4.25%
​ ​
19.77%
​ ​
17.27% – 23.80%
​
​
12/31/2025
​ ​
3.48%
​ ​
17.34%
​ ​
16.71% – 27.48%
​
2023 – 2028
 ​ ​
12/31/2023
​ ​
3.85%
​ ​
26.20%
​ ​
24.49% – 30.56%
​
​
12/31/2024
​ ​
4.32%
​ ​
19.82%
​ ​
18.15% – 22.91%
​
​
12/31/2025
​ ​
3.54%
​ ​
18.93%
​ ​
17.19% – 26.33%
​
2023 – 2025
 ​ ​
12/31/2023
​ ​
4.23%
​ ​
22.0%
​ ​
19.98% – 24.79%
​
​
12/31/2024
​ ​
4.16%
​ ​
17.05%
​ ​
15.08% – 23.65%
​
​
(10)
No adjustments were required with respect to the dollar value of dividends or other earnings paid on stock or option awards, because the value of dividend equivalents accrued on such awards are included in the calculation of the fair value of such awards as of each applicable valuation date.
       
Company Selected Measure Name     Ameren Adjusted(Non-GAAP) AnnualEarnings Per Share        
Named Executive Officers, Footnote    
(1)
Mr. Birk served as the PEO during 2022, 2023, 2024, and through October 2, 2025, when he retired. Mr. Lyons served as the PEO in 2021.
​
(2)
Effective with Mr. Birk’s retirement, Mr. Moehn began serving as the PEO effective October 2, 2025.
(3)
The non-PEO NEOs for the applicable periods are: Mr. Lyons (2022-2025), Mr. Moehn (2021-October 2, 2025), Mr. Warner L. Baxter (2021-2022), Ms. Chonda J. Nwamu (2021-2024), Mr. Diya (2021; 2023-2025), Mr. Lindgren (2025), and Ms. Shaw (2025).
       
Peer Group Issuers, Footnote    
(6)
The Company does not have publicly traded shares of common stock and, as a result, does not have a “total shareholder return”. As a result no cumulative total shareholder return or peer group cumulative total shareholder return has been included in this table.
       
Adjustment To PEO Compensation, Footnote    
(4)
To calculate CAP for the PEOs, as reported in column (c), the following amounts were deducted from and added to the PEO’s total compensation, as reported in the SCT:
​
​ ​ ​
2025
 ​ ​
2025
 ​
​ ​ ​
PEO #1 (Birk)
​ ​
PEO #2 (Moehn)
​
SCT Total for PEO ​ ​ ​ ​ 2,860,218 ​ ​ ​ ​ ​ 6,383,194 ​ ​
Deductions from SCT: ​ ​ ​ ​ ​ ​ ​ ​
Grant Date Fair Value of Equity-Based Awards Granted in Year (as Reported in Column (e) 
of the SCT) 		​ ​ ​ ​ (1,883,848) ​ ​ ​ ​ ​ (3,491,892) ​ ​
Change in Pension Value (as included in column (g) of the SCT) ​ ​ ​ ​ (255,640) ​ ​ ​ ​ ​ (236,925) ​ ​
Additions to SCT: ​ ​ ​ ​ ​ ​ ​ ​
Fair Value at Year-end of Unvested Awards Granted in Year(9) ​ ​ ​ ​ 456,345 ​ ​ ​ ​ ​ 3,370,918 ​ ​
Change in Fair Value of Awards Granted in Prior Years that Vested during the Year(8) ​ ​ ​ ​ 165,201 ​ ​ ​ ​ ​ 422,337 ​ ​
Change in Fair Value of Unvested Awards Granted in Prior Years that Remain Unvested and Outstanding at Year-End(8) ​ ​ ​ ​ 432,917 ​ ​ ​ ​ ​ 2,461,320 ​ ​
Fair Value of Prior Year Awards Forfeited During the Year ​ ​ ​ ​ (1,020,037) ​ ​ ​ ​ ​ — ​ ​
Service Cost for all Defined Benefit Pension Plans ​ ​ ​ ​ 58,833 ​ ​ ​ ​ ​ 185,763 ​ ​
Compensation Actually Paid to PEO(10) ​ ​ ​ ​ 813,989 ​ ​ ​ ​ ​ 9,094,715 ​ ​
(9)
The below table provides the valuation assumptions used in determining the fair value of equity awards (on the respective valuation dates) that are materially different from those originally disclosed as of the grant date of such equity awards.
​
Performance Period
​ ​
Valuation Date
 ​ ​
Risk-Free Rate
 ​ ​
Ameren’s Common
Stock Volatility
 ​ ​
Volatility Range for the
Peer Group
 ​
2025 – 2027
 ​ ​
12/31/2025
​ ​
3.47%
​ ​
17.19%
​ ​
16.30% – 25.64%
​
2024 – 2026
 ​ ​
12/31/2024
​ ​
4.25%
​ ​
19.77%
​ ​
17.27% – 23.80%
​
​
12/31/2025
​ ​
3.48%
​ ​
17.34%
​ ​
16.71% – 27.48%
​
2023 – 2028
 ​ ​
12/31/2023
​ ​
3.85%
​ ​
26.20%
​ ​
24.49% – 30.56%
​
​
12/31/2024
​ ​
4.32%
​ ​
19.82%
​ ​
18.15% – 22.91%
​
​
12/31/2025
​ ​
3.54%
​ ​
18.93%
​ ​
17.19% – 26.33%
​
2023 – 2025
 ​ ​
12/31/2023
​ ​
4.23%
​ ​
22.0%
​ ​
19.98% – 24.79%
​
​
12/31/2024
​ ​
4.16%
​ ​
17.05%
​ ​
15.08% – 23.65%
​
​
(10)
No adjustments were required with respect to the dollar value of dividends or other earnings paid on stock or option awards, because the value of dividend equivalents accrued on such awards are included in the calculation of the fair value of such awards as of each applicable valuation date.
       
Non-PEO NEO Average Total Compensation Amount     $ 5,279,317 $ 4,933,199 $ 6,033,703 $ 5,100,902 $ 4,578,798
Non-PEO NEO Average Compensation Actually Paid Amount     $ 5,675,669 9,345,357 2,478,194 6,083,692 6,226,159
Adjustment to Non-PEO NEO Compensation Footnote    
(5)
To calculate Average CAP for the other NEOs, as reported in column (e), the following amounts were deducted from and added to the NEOs’ total compensation, as reported in the SCT:
​
​ ​ ​
2025
 ​
Average SCT Total Compensation for Non-PEO NEOs ​ ​ ​ ​ 5,279,317 ​ ​
Deductions from SCT: ​ ​ ​ ​ ​ ​ ​
Grant Date Fair Value of Equity-Based Awards Granted in Year (as Reported in Column (e) of the SCT) ​ ​ ​ ​ (2,820,446) ​ ​
Change in Pension Value (as included in column (g) of the SCT) ​ ​ ​ ​ (241,090) ​ ​
Additions to SCT: ​ ​ ​ ​ ​ ​ ​
Fair Value at Year-end of Unvested Awards Granted in Year(9) ​ ​ ​ ​ 2,407,503 ​ ​
Change in Fair Value of Awards Granted in Prior Years that Vested during the Year(9) ​ ​ ​ ​ 228,235 ​ ​
Change in Fair Value of Unvested Awards Granted in Prior Years that Remain Unvested and Outstanding at Year-End(9) ​ ​ ​ ​ 978,480 ​ ​
Fair Value of Prior Year Awards Forfeited During the Year ​ ​ ​ ​ (285,724) ​ ​
Service Cost for all Defined Benefit Pension Plans ​ ​ ​ ​ 129,394 ​ ​
Average Compensation Actually Paid to Non-PEO NEOs(10) ​ ​ ​ ​ 5,675,669 ​ ​
(9)
The below table provides the valuation assumptions used in determining the fair value of equity awards (on the respective valuation dates) that are materially different from those originally disclosed as of the grant date of such equity awards.
​
Performance Period
​ ​
Valuation Date
 ​ ​
Risk-Free Rate
 ​ ​
Ameren’s Common
Stock Volatility
 ​ ​
Volatility Range for the
Peer Group
 ​
2025 – 2027
 ​ ​
12/31/2025
​ ​
3.47%
​ ​
17.19%
​ ​
16.30% – 25.64%
​
2024 – 2026
 ​ ​
12/31/2024
​ ​
4.25%
​ ​
19.77%
​ ​
17.27% – 23.80%
​
​
12/31/2025
​ ​
3.48%
​ ​
17.34%
​ ​
16.71% – 27.48%
​
2023 – 2028
 ​ ​
12/31/2023
​ ​
3.85%
​ ​
26.20%
​ ​
24.49% – 30.56%
​
​
12/31/2024
​ ​
4.32%
​ ​
19.82%
​ ​
18.15% – 22.91%
​
​
12/31/2025
​ ​
3.54%
​ ​
18.93%
​ ​
17.19% – 26.33%
​
2023 – 2025
 ​ ​
12/31/2023
​ ​
4.23%
​ ​
22.0%
​ ​
19.98% – 24.79%
​
​
12/31/2024
​ ​
4.16%
​ ​
17.05%
​ ​
15.08% – 23.65%
​
​
(10)
No adjustments were required with respect to the dollar value of dividends or other earnings paid on stock or option awards, because the value of dividend equivalents accrued on such awards are included in the calculation of the fair value of such awards as of each applicable valuation date.
       
Equity Valuation Assumption Difference, Footnote    
(9)
The below table provides the valuation assumptions used in determining the fair value of equity awards (on the respective valuation dates) that are materially different from those originally disclosed as of the grant date of such equity awards.
​
Performance Period
​ ​
Valuation Date
 ​ ​
Risk-Free Rate
 ​ ​
Ameren’s Common
Stock Volatility
 ​ ​
Volatility Range for the
Peer Group
 ​
2025 – 2027
 ​ ​
12/31/2025
​ ​
3.47%
​ ​
17.19%
​ ​
16.30% – 25.64%
​
2024 – 2026
 ​ ​
12/31/2024
​ ​
4.25%
​ ​
19.77%
​ ​
17.27% – 23.80%
​
​
12/31/2025
​ ​
3.48%
​ ​
17.34%
​ ​
16.71% – 27.48%
​
2023 – 2028
 ​ ​
12/31/2023
​ ​
3.85%
​ ​
26.20%
​ ​
24.49% – 30.56%
​
​
12/31/2024
​ ​
4.32%
​ ​
19.82%
​ ​
18.15% – 22.91%
​
​
12/31/2025
​ ​
3.54%
​ ​
18.93%
​ ​
17.19% – 26.33%
​
2023 – 2025
 ​ ​
12/31/2023
​ ​
4.23%
​ ​
22.0%
​ ​
19.98% – 24.79%
​
​
12/31/2024
​ ​
4.16%
​ ​
17.05%
​ ​
15.08% – 23.65%
​
       
Compensation Actually Paid vs. Company Selected Measure    
Relationship Between Compensation Actually Paid and Performance Measures in the PVP Table
The most important annual financial measure that Ameren uses to link pay to performance is Ameren’s annual GAAP diluted EPS, which is not only the most heavily weighted metric in the STIP, but also generally consistent with Ameren’s TSR, which is the most heavily weighted performance metric in the LTIP. As shown in the chart below, Ameren’s GAAP diluted EPS increased by 7.8% between 2021 and 2022, while the PEO CAP and and the Average NEO CAP decreased by 56.3% and 2.3%, respectively, driven primarily by a new PEO in 2022. In 2023, while the PEO CAP and the Average NEO CAP decreased by 51.4% and 59.3% respectively, driven primarily by the impact on the fair value of outstanding equity awards of the fourth quarter 2023 Ameren stock price decline as a result of the unfavorable regulatory outcomes in Ameren Illinois’ natural gas and multi-year electric distribution rate review and grid plan proceedings, Ameren’s GAAP diluted EPS increased by 5.8%. In 2024, the PEO CAP and the Average NEO CAP increased by 278.7% and 277.1% respectively, and the Company’s adjusted (non-GAAP) diluted EPS increased by 5.7%. In 2025, the PEO CAP increased by 89.1% and the Average NEO CAP decreased by 39.3%, due primarily to the new PEO appointment in the fourth quarter, and the Company’s adjusted (non-GAAP) diluted EPS increased by 8.6%. During the five-year period (2021-2025), the Company’s net income increased by 44.2%.
[MISSING IMAGE: bc_unionelectric-pn.jpg]
(1)
Except for 2024 and 2025, EPS amounts in the chart represent both Ameren’s GAAP diluted EPS and its adjusted (non-GAAP) diluted EPS. See Appendix A for a reconciliation of Ameren’s GAAP to adjusted (non-GAAP) EPS for 2024 and 2025.
       
Tabular List, Table    
Additional Company-Selected Performance Measures
The following table represents the unranked list of the most important performance measures used to align compensation actually paid to the PEO and NEOs for 2025 to the performance of Ameren and its subsidiaries, including the Company. While these performance measures are the most important measures, additional measures were also considered to align the PEO and NEOs’ pay and performance as further described in the “Compensation Discussion and Analysis” section above.
​ Ameren Annual EPS ​
​ Ameren Three-Year TSR Ranking vs. the TSR Peer Group ​
​ Energy Transition metric ​
       
Net Income (Loss)     $ 747,000,000 $ 559,000,000 $ 545,000,000 $ 562,000,000 $ 518,000,000
Company Selected Measure Amount | $ / shares     5.03 4.63 4.38 4.14 3.84
PEO Name Mr. Moehn Mr. Birk          
Measure:: 1              
Pay vs Performance Disclosure              
Name     Ameren Annual EPS        
Non-GAAP Measure Description    
(8)
Our named executive officers are compensated by Ameren in accordance with its executive compensation policies. The Company does not make independent decisions regarding the compensation of its executive officers. As a result, the company-selected measure included in this table is Ameren’s adjusted (non-GAAP) diluted EPS for the respective year, which reflects the financial performance measure that in Ameren’s assessment represents the most important financial measure used to link compensation actually paid for the most recently completed fiscal year to company performance. Except for 2024 and 2025, values reported represent Ameren’s GAAP diluted EPS and adjusted (non-GAAP) diluted EPS. See Appendix A for a reconciliation of GAAP to adjusted (non-GAAP) EPS for 2024 and 2025.
       
Measure:: 2              
Pay vs Performance Disclosure              
Name     Ameren Three-Year TSR Ranking vs. the TSR Peer Group        
Measure:: 3              
Pay vs Performance Disclosure              
Name     Energy Transition metric        
2025 – 2027              
Pay vs Performance Disclosure              
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate     3.47%        
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate     17.19%        
Volatility Range for Peer Group Minimum     16.3        
Volatility Range for Peer Group Maximum     25.64        
2024 – 2026              
Pay vs Performance Disclosure              
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate     3.48% 4.25%      
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate     17.34% 19.77%      
Volatility Range for Peer Group Minimum     16.71 17.27      
Volatility Range for Peer Group Maximum     27.48 23.8      
2023 – 2028              
Pay vs Performance Disclosure              
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate     3.54% 4.32% 3.85%    
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate     18.93% 19.82% 26.20%    
Volatility Range for Peer Group Minimum     17.19 18.15 24.49    
Volatility Range for Peer Group Maximum     26.33 22.91 30.56    
2023 – 2025              
Pay vs Performance Disclosure              
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate       4.16% 4.23%    
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate       17.05% 22.00%    
Volatility Range for Peer Group Minimum       15.08 19.98    
Volatility Range for Peer Group Maximum       23.65 24.79    
Mr Birk [Member]              
Pay vs Performance Disclosure              
PEO Total Compensation Amount     $ 2,860,218 $ 2,973,817 $ 2,892,627 $ 2,376,562  
PEO Actually Paid Compensation Amount     813,989 4,808,411 1,269,859 2,614,438  
Michael L. Moehn [Member]              
Pay vs Performance Disclosure              
PEO Total Compensation Amount     6,383,194
PEO Actually Paid Compensation Amount     9,094,715
Mr. Lyons [Member]              
Pay vs Performance Disclosure              
PEO Total Compensation Amount             4,305,713
PEO Actually Paid Compensation Amount             $ 5,977,831
PEO | Mr Birk [Member] | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member]              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     (1,883,848)        
PEO | Mr Birk [Member] | Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member]              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     (255,640)        
PEO | Mr Birk [Member] | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member]              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     456,345        
PEO | Mr Birk [Member] | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member]              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     165,201        
PEO | Mr Birk [Member] | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member]              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     432,917        
PEO | Mr Birk [Member] | Fair Value Of Prior Year Awards Forfeited During The Year [Member]              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     (1,020,037)        
PEO | Mr Birk [Member] | Pension Adjustments Service Cost [Member]              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     58,833        
PEO | Michael L. Moehn [Member] | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member]              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     (3,491,892)        
PEO | Michael L. Moehn [Member] | Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member]              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     (236,925)        
PEO | Michael L. Moehn [Member] | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member]              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     3,370,918        
PEO | Michael L. Moehn [Member] | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member]              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     422,337        
PEO | Michael L. Moehn [Member] | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member]              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     2,461,320        
PEO | Michael L. Moehn [Member] | Fair Value Of Prior Year Awards Forfeited During The Year [Member]              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount            
PEO | Michael L. Moehn [Member] | Pension Adjustments Service Cost [Member]              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     185,763        
Non-PEO NEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member]              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     (2,820,446)        
Non-PEO NEO | Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member]              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     (241,090)        
Non-PEO NEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member]              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     2,407,503        
Non-PEO NEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member]              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     228,235        
Non-PEO NEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member]              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     978,480        
Non-PEO NEO | Fair Value Of Prior Year Awards Forfeited During The Year [Member]              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     (285,724)        
Non-PEO NEO | Pension Adjustments Service Cost [Member]              
Pay vs Performance Disclosure              
Adjustment to Compensation, Amount     $ 129,394