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v3.26.1

Investments - Additional Information (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2026 USD ($) security | Jun. 30, 2025 USD ($) | Jun. 30, 2026 USD ($) security | Jun. 30, 2025 USD ($) | Dec. 31, 2025 USD ($)
Net Investment Income [Line Items] |  |  |  |  |
Gross unrealized losses (less than for December 31, 2025) | $ 4.0 |  | $ 4.0 |  | $ 0.0
Pre-tax net realized capital gains (losses) | $ 0.2 | $ (0.1) | $ 0.5 | $ (0.1) |
Number of debt securities held, unrealized loss position | security | 541 |  | 541 |  |
Gross unrealized losses, twelve months or more | $ 0.0 |  | $ 0.0 |  | 0.0
Financing receivable, allowance for credit loss | 0.0 |  | 0.0 |  |
Restricted investments | 82.5 |  | 82.5 |  | 81.5
Fixed Income Securities |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Gross unrealized losses (less than for December 31, 2025) | $ 4.0 |  | $ 4.0 |  | 0.1
Gross unrealized losses, twelve months or more |  |  |  |  | $ 0.1

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