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Investments - Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Net Investment Income [Line Items] |  |  |  |
Total | $ 9.8 | $ 9.5 | $ 19.7 | $ 19.1
Investment expense | 0.1 | 0.1 | 0.2 | 0.2
Net investment income | 9.7 | 9.4 | 19.5 | 18.9
Interest on cash and cash equivalents |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total |  |  | 4.0 | 4.2
Net investment income | 1.9 | 2.1 |  |
Fixed maturities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total |  |  | 15.5 | 14.4
Net investment income | 7.8 | 7.2 |  |
Short-term investments |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total |  |  | $ 0.2 | $ 0.5
Net investment income | $ 0.1 | $ 0.2 |  |

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