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v3.24.0.1

Investments - Fixed Maturities Securities and Short-Term Investments (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 164.6 | $ 127.3
Unrealized Gains | 1.2 | 0.2
Unrealized Losses | (4.1) | (6.4)
Fair Value | 161.7 | 121.1
Amortized Cost | 187.1 | 325.6
Unrealized Gains | 0.0 | 0.0
Unrealized Losses | 0.0 | (0.8)
Fair Value | 187.1 | 324.8
Amortized Cost | 351.7 | 452.9
Unrealized Gains | 1.2 | 0.2
Unrealized Losses | (4.1) | (7.2)
Total investments | 348.8 | 445.9
U.S. government and agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 18.6 | 21.6
Unrealized Gains | 0.0 | 0.0
Unrealized Losses | (0.2) | (0.5)
Fair Value | 18.4 | 21.1
Amortized Cost | 137.7 | 129.1
Unrealized Gains | 0.0 | 0.0
Unrealized Losses | 0.0 | (0.2)
Fair Value | 137.7 | 128.9
States and other territories |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 9.3 | 8.9
Unrealized Gains | 0.0 | 0.0
Unrealized Losses | (0.4) | (0.6)
Fair Value | 8.9 | 8.3
Corporate securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 91.3 | 54.8
Unrealized Gains | 1.1 | 0.1
Unrealized Losses | (1.3) | (2.4)
Fair Value | 91.1 | 52.5
Amortized Cost | 14.9 | 49.4
Unrealized Gains | 0.0 | 0.0
Unrealized Losses | 0.0 | 0.0
Fair Value | 14.9 | 49.4
Foreign securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 0.9 | 0.9
Unrealized Gains | 0.0 | 0.0
Unrealized Losses | 0.0 | (0.1)
Fair Value | 0.9 | 0.8
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 20.7 | 20.4
Unrealized Gains | 0.1 | 0.1
Unrealized Losses | (1.3) | (1.6)
Fair Value | 19.5 | 18.9
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 7.7 | 6.5
Unrealized Gains | 0.0 | 0.0
Unrealized Losses | (0.6) | (0.7)
Fair Value | 7.1 | 5.8
Asset backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 16.1 | 14.2
Unrealized Gains | 0.0 | 0.0
Unrealized Losses | (0.3) | (0.5)
Fair Value | 15.8 | 13.7
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 34.5 | 147.1
Unrealized Gains | 0.0 | 0.0
Unrealized Losses | 0.0 | (0.6)
Fair Value | $ 34.5 | $ 146.5

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