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INVESTMENTS - Unrealized Losses (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Less than 12 months, fair value $ 95.1 $ 39.7
Less than 12 months, unrealized loss (2.4) (0.4)
12 months or more, fair value 19.5 16.1
12 months or more, unrealized loss (1.0) (0.4)
Total, fair value 114.6 55.8
Total, unrealized loss (3.4) (0.8)
U.S. Treasury securities and agencies    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 7.5 7.5
Less than 12 months, unrealized loss (0.1) (0.1)
12 months or more, fair value 14.3 14.0
12 months or more, unrealized loss (0.5) (0.3)
Total, fair value 21.8 21.5
Total, unrealized loss (0.6) (0.4)
Municipal securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 14.9 8.9
Less than 12 months, unrealized loss (0.5) (0.1)
12 months or more, fair value 2.0 0.0
12 months or more, unrealized loss (0.2) 0.0
Total, fair value 16.9 8.9
Total, unrealized loss (0.7) (0.1)
Corporate debt securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 39.8 12.7
Less than 12 months, unrealized loss (1.1) (0.1)
12 months or more, fair value 2.3 1.6
12 months or more, unrealized loss (0.2) (0.1)
Total, fair value 42.1 14.3
Total, unrealized loss (1.3) (0.2)
Residential mortgage-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 2.2 1.9
Less than 12 months, unrealized loss (0.1) 0.0
12 months or more, fair value 0.5 0.5
12 months or more, unrealized loss (0.1) 0.0
Total, fair value 2.7 2.4
Total, unrealized loss (0.2) 0.0
Commercial mortgage backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 27.7 8.7
Less than 12 months, unrealized loss (0.6) (0.1)
12 months or more, fair value 0.4 0.0
12 months or more, unrealized loss 0.0 0.0
Total, fair value 28.1 8.7
Total, unrealized loss (0.6) $ (0.1)
Other debt obligations    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 2.5  
Less than 12 months, unrealized loss 0.0  
12 months or more, fair value 0.0  
12 months or more, unrealized loss 0.0  
Total, fair value 2.5  
Total, unrealized loss 0.0  
Total fixed maturities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 94.6  
Less than 12 months, unrealized loss (2.4)  
12 months or more, fair value 19.5  
12 months or more, unrealized loss (1.0)  
Total, fair value 114.1  
Total, unrealized loss (3.4)  
Short-term investments    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 0.5  
Less than 12 months, unrealized loss 0.0  
12 months or more, fair value 0.0  
12 months or more, unrealized loss 0.0  
Total, fair value 0.5  
Total, unrealized loss $ 0.0