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INVESTMENTS - Amortized Cost and Fair Value (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 238.9 $ 169.3
Allowance for Expected Credit Losses 0.0 0.0
Gross Unrealized Gains 0.3 0.7
Gross Unrealized Losses (3.7) (3.2)
Fair Value 235.5 166.8
U.S. Treasury securities and agencies    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 28.6 14.6
Allowance for Expected Credit Losses 0.0 0.0
Gross Unrealized Gains 0.1 0.1
Gross Unrealized Losses (0.3) (0.1)
Fair Value 28.4 14.6
Municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 23.8 24.8
Allowance for Expected Credit Losses 0.0 0.0
Gross Unrealized Gains 0.0 0.1
Gross Unrealized Losses (0.7) (0.8)
Fair Value 23.1 24.1
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 84.7 66.3
Allowance for Expected Credit Losses 0.0 0.0
Gross Unrealized Gains 0.1 0.2
Gross Unrealized Losses (1.5) (1.3)
Fair Value 83.3 65.2
Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 21.0 12.0
Allowance for Expected Credit Losses 0.0 0.0
Gross Unrealized Gains 0.1 0.1
Gross Unrealized Losses (0.4) (0.2)
Fair Value 20.7 11.9
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 42.1 30.4
Allowance for Expected Credit Losses 0.0 0.0
Gross Unrealized Gains 0.0 0.1
Gross Unrealized Losses (0.7) (0.7)
Fair Value 41.4 29.8
Other debt obligations    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 27.0 20.3
Allowance for Expected Credit Losses 0.0 0.0
Gross Unrealized Gains 0.0 0.1
Gross Unrealized Losses (0.1) (0.1)
Fair Value 26.9 20.3
Total fixed maturities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 227.2 168.4
Allowance for Expected Credit Losses 0.0 0.0
Gross Unrealized Gains 0.3 0.7
Gross Unrealized Losses (3.7) (3.2)
Fair Value 223.8 165.9
Short-term investments    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 11.7 0.9
Allowance for Expected Credit Losses 0.0 0.0
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Fair Value $ 11.7 $ 0.9