Janus Henderson Overseas Portfolio Average Annual Total Returns - Institutional Shares [Member] |
12 Months Ended | 60 Months Ended | 120 Months Ended |
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
|
| MSCI All Country World ex-USA IndexSM (reflects no deduction for fees, expenses, or taxes, except foreign withholding taxes)[Member] | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 32.39% | 7.91% | 8.41% |
| Institutional Shares | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 28.87% | 9.44% | 9.24% |