XML 49 R37.htm IDEA: XBRL DOCUMENT v3.24.2.u1
INVESTMENTS - Unrealized Losses (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Less than 12 months, fair value $ 118.9 $ 36.1
Less than 12 months, unrealized loss (0.9) (0.1)
12 months or more, fair value 73.7 72.3
12 months or more, unrealized loss (2.8) (3.1)
Total, fair value 192.6 108.4
Total, unrealized loss (3.7) (3.2)
U.S. Treasury securities and agencies    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 23.0 1.7
Less than 12 months, unrealized loss (0.2) 0.0
12 months or more, fair value 2.6 2.4
12 months or more, unrealized loss (0.1) (0.1)
Total, fair value 25.6 4.1
Total, unrealized loss (0.3) (0.1)
Municipal securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 7.8 3.1
Less than 12 months, unrealized loss 0.0 0.0
12 months or more, fair value 12.5 15.1
12 months or more, unrealized loss (0.7) (0.8)
Total, fair value 20.3 18.2
Total, unrealized loss (0.7) (0.8)
Corporate debt securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 33.1 13.4
Less than 12 months, unrealized loss (0.3) 0.0
12 months or more, fair value 34.3 35.1
12 months or more, unrealized loss (1.2) (1.3)
Total, fair value 67.4 48.5
Total, unrealized loss (1.5) (1.3)
Residential mortgage-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 14.2 4.1
Less than 12 months, unrealized loss (0.1) 0.0
12 months or more, fair value 2.3 1.9
12 months or more, unrealized loss (0.3) (0.2)
Total, fair value 16.5 6.0
Total, unrealized loss (0.4) (0.2)
Commercial mortgage-backed securities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 15.8 9.1
Less than 12 months, unrealized loss (0.2) (0.1)
12 months or more, fair value 18.1 13.4
12 months or more, unrealized loss (0.5) (0.6)
Total, fair value 33.9 22.5
Total, unrealized loss (0.7) (0.7)
Other debt obligations    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 15.6 4.4
Less than 12 months, unrealized loss (0.1) 0.0
12 months or more, fair value 3.9 4.4
12 months or more, unrealized loss 0.0 (0.1)
Total, fair value 19.5 8.8
Total, unrealized loss (0.1) (0.1)
Total fixed maturities    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 109.5 35.8
Less than 12 months, unrealized loss (0.9) (0.1)
12 months or more, fair value 73.7 72.3
12 months or more, unrealized loss (2.8) (3.1)
Total, fair value 183.2 108.1
Total, unrealized loss (3.7) (3.2)
Short-term investments    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Less than 12 months, fair value 9.4 0.3
Less than 12 months, unrealized loss 0.0 0.0
12 months or more, fair value 0.0 0.0
12 months or more, unrealized loss 0.0 0.0
Total, fair value 9.4 0.3
Total, unrealized loss $ 0.0 $ 0.0