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Investments - Fixed Maturities Securities and Short-term Investments (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized Cost |  |
Amortized Cost | $ 170.6 | $ 164.6
Amortized Cost | 148.5 | 187.1
Amortized Cost | 319.1 | 351.7
Gross Unrealized Gains |  |
Gross Unrealized Gains | 0.5 | 1.2
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Gains | 0.5 | 1.2
Gross Unrealized Losses |  |
Gross Unrealized Losses | (4.1) | (4.1)
Gross Unrealized Losses | 0.0 | 0.0
Gross Unrealized Losses | (4.1) | (4.1)
Fair Value |  |
Fair Value | 167.0 | 161.7
Fair Value | 148.5 | 187.1
Total investments | 315.5 | 348.8
U.S. government and agencies |  |
Amortized Cost |  |
Amortized Cost | 17.6 | 18.6
Amortized Cost | 103.8 | 137.7
Gross Unrealized Gains |  |
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses |  |
Gross Unrealized Losses | (0.2) | (0.2)
Gross Unrealized Losses | 0.0 | 0.0
Fair Value |  |
Fair Value | 17.4 | 18.4
Fair Value | 103.8 | 137.7
States and other territories |  |
Amortized Cost |  |
Amortized Cost | 8.4 | 9.3
Gross Unrealized Gains |  |
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses |  |
Gross Unrealized Losses | (0.4) | (0.4)
Fair Value |  |
Fair Value | 8.0 | 8.9
Corporate securities |  |
Amortized Cost |  |
Amortized Cost | 100.7 | 91.3
Amortized Cost | 25.3 | 14.9
Gross Unrealized Gains |  |
Gross Unrealized Gains | 0.5 | 1.1
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses |  |
Gross Unrealized Losses | (1.4) | (1.3)
Gross Unrealized Losses | 0.0 | 0.0
Fair Value |  |
Fair Value | 99.8 | 91.1
Fair Value | 25.3 | 14.9
Foreign securities |  |
Amortized Cost |  |
Amortized Cost | 0.9 | 0.9
Gross Unrealized Gains |  |
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses |  |
Gross Unrealized Losses | 0.0 | 0.0
Fair Value |  |
Fair Value | 0.9 | 0.9
Residential mortgage-backed securities |  |
Amortized Cost |  |
Amortized Cost | 19.7 | 20.7
Gross Unrealized Gains |  |
Gross Unrealized Gains | 0.0 | 0.1
Gross Unrealized Losses |  |
Gross Unrealized Losses | (1.6) | (1.3)
Fair Value |  |
Fair Value | 18.1 | 19.5
Commercial mortgage-backed securities |  |
Amortized Cost |  |
Amortized Cost | 7.6 | 7.7
Gross Unrealized Gains |  |
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses |  |
Gross Unrealized Losses | (0.4) | (0.6)
Fair Value |  |
Fair Value | 7.2 | 7.1
Asset backed securities |  |
Amortized Cost |  |
Amortized Cost | 15.7 | 16.1
Gross Unrealized Gains |  |
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses |  |
Gross Unrealized Losses | (0.1) | (0.3)
Fair Value |  |
Fair Value | 15.6 | 15.8
Commercial paper |  |
Amortized Cost |  |
Amortized Cost | 19.4 | 34.5
Gross Unrealized Gains |  |
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses |  |
Gross Unrealized Losses | 0.0 | 0.0
Fair Value |  |
Fair Value | $ 19.4 | $ 34.5

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