Janus Henderson Mid Cap Value Portfolio Investment Objectives and Goals - Institutional Shares [Member] - Janus Henderson Mid Cap Value 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 Mid Cap Value 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 Mid Cap Value Portfolio (“Mid Cap Value Portfolio”) seeks capital appreciation.