XML 64 R43.htm IDEA: XBRL DOCUMENT v3.23.2
INVESTMENTS - Investments in Continuous Loss Position (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]    
Fair value, less than 12 months $ 85.1 $ 353.9
Gross unrealized losses, less than 12 months (1.0) (8.1)
Fair value, 12 months or greater 1,082.0 1,111.4
Gross unrealized losses, 12 months or greater (48.2) (60.0)
Fair value, total 1,167.1 1,465.3
Gross unrealized losses, total (49.2) (68.1)
U.S. government and agency securities    
Debt Securities, Available-for-sale [Line Items]    
Fair value, less than 12 months 10.9 61.6
Gross unrealized losses, less than 12 months (0.1) (1.5)
Fair value, 12 months or greater 86.2 69.5
Gross unrealized losses, 12 months or greater (4.9) (4.6)
Fair value, total 97.1 131.1
Gross unrealized losses, total (5.0) (6.1)
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Fair value, less than 12 months 50.9 103.3
Gross unrealized losses, less than 12 months (0.8) (1.3)
Fair value, 12 months or greater 199.9 254.6
Gross unrealized losses, 12 months or greater (9.2) (12.7)
Fair value, total 250.8 357.9
Gross unrealized losses, total (10.0) (14.0)
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Fair value, less than 12 months 23.3 189.0
Gross unrealized losses, less than 12 months (0.1) (5.3)
Fair value, 12 months or greater 793.3 784.8
Gross unrealized losses, 12 months or greater (33.9) (42.5)
Fair value, total 816.6 973.8
Gross unrealized losses, total (34.0) (47.8)
Municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Fair value, less than 12 months 0.0 0.0
Gross unrealized losses, less than 12 months 0.0 0.0
Fair value, 12 months or greater 2.6 2.5
Gross unrealized losses, 12 months or greater (0.2) (0.2)
Fair value, total 2.6 2.5
Gross unrealized losses, total $ (0.2) $ (0.2)