Janus Henderson Balanced Portfolio Expense Example - Institutional Shares [Member] - Janus Henderson Balanced Portfolio - Institutional Shares	Dec. 31, 2025 USD ($)
Prospectus [Line Items]
Expense Example, with Redemption, 1 Year	$ 63
Expense Example, with Redemption, 3 Years	199
Expense Example, with Redemption, 5 Years	346
Expense Example, with Redemption, 10 Years	$ 774

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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