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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