Janus Henderson Balanced Portfolio Investment Objectives and Goals - Institutional Shares [Member] - Janus Henderson Balanced Portfolio	Dec. 31, 2025
Prospectus [Line Items]
Risk/Return [Heading]	<span style="color:#000000;font-family:Times New Roman;font-size:15.20pt;font-weight:bold;">Janus Henderson Balanced Portfolio</span>
Objective [Heading]	<span style="color:#FFFFFF;font-family:Times New Roman;font-size:10.45pt;font-weight:bold;margin-left:0.0pt;text-transform:uppercase;">Investment Objective</span>
Objective, Primary [Text Block]	Janus Henderson Balanced Portfolio (“Balanced Portfolio”) seeks long-term capital growth, consistent with preservation of capital and balanced by current income.