Janus Henderson Overseas Portfolio Investment Objectives and Goals - Service Shares [Member] - Janus Henderson Overseas 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 Overseas 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 Overseas Portfolio (“Overseas Portfolio”) seeks long-term growth of capital.