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v3.26.1

Investments - Amortized Cost and Fair Values of Investment in Fixed Maturities (Details) - USD ($) $ in Millions | Jun. 30, 2026 | Dec. 31, 2025
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | $ 772.4 | $ 706.0
Gross Unrealized Gains | 0.1 | 2.8
Gross Unrealized Losses | (4.0) | 0.0
Fair Value | 768.5 | 708.8
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | 503.4 | 499.2
Gross Unrealized Gains | 0.1 | 2.0
Gross Unrealized Losses | (2.1) | 0.0
Fair Value | 501.4 | 501.2
U.S. Government obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | 157.5 | 139.5
Gross Unrealized Gains | 0.0 | 0.6
Gross Unrealized Losses | (1.5) | 0.0
Fair Value | 156.0 | 140.1
Asset-backed securities and collateralized loan obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | 82.5 | 45.3
Gross Unrealized Gains | 0.0 | 0.2
Gross Unrealized Losses | (0.3) | 0.0
Fair Value | 82.2 | 45.5
Non-U.S. government obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | 29.0 | 22.0
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | (0.1) | 0.0
Fair Value | $ 28.9 | $ 22.0

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