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Janus Henderson Global Sustainable Equity Portfolio Annual Fund Operating Expenses - Institutional Shares [Member] - Janus Henderson Global Sustainable Equity Portfolio
Dec. 31, 2025
Prospectus [Line Items]  
Fee Waiver or Reimbursement over Assets, Date of Termination <span style="font-family:Times New Roman;font-size:7.60pt;">The Adviser has contractually agreed to waive its investment advisory fee and/or reimburse Portfolio expenses to the extent that the Portfolio’s total annual fund operating expenses (excluding shareholder servicing fees, out-of-pocket transfer agency/shareholder servicing costs, acquired fund fees and expenses, interest, dividends, taxes, brokerage commissions, and extraordinary expenses) exceed 0.68% for at least a one-year period commencing on April 30, 2026. This contractual waiver may be terminated or modified only at the discretion of the Portfolio’s Board of Trustees.</span>
Institutional Shares  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.75%
Other Expenses (as a percentage of Assets): 1.41%
Expenses (as a percentage of Assets) 2.16%
Fee Waiver or Reimbursement (1.42%) [1]
Net Expenses (as a percentage of Assets) 0.74% [1]
[1] The Adviser has contractually agreed to waive its investment advisory fee and/or reimburse Portfolio expenses to the extent that the Portfolio’s total annual fund operating expenses (excluding shareholder servicing fees, out-of-pocket transfer agency/shareholder servicing costs, acquired fund fees and expenses, interest, dividends, taxes, brokerage commissions, and extraordinary expenses) exceed 0.68% for at least a one-year period commencing on April 30, 2026. This contractual waiver may be terminated or modified only at the discretion of the Portfolio’s Board of Trustees.