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INVESTMENTS - Investments in Continuous Loss Position (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]    
Fair value, less than twelve months $ 100.5 $ 353.9
Gross unrealized losses, less than twelve months (1.0) (8.1)
Fair value, twelve months or greater 1,191.2 1,111.4
Gross unrealized losses, twelve months or greater (54.1) (60.0)
Fair value, total 1,291.7 1,465.3
Gross unrealized losses, total (55.1) (68.1)
U.S. government and agency securities    
Debt Securities, Available-for-sale [Line Items]    
Fair value, less than twelve months 10.6 61.6
Gross unrealized losses, less than twelve months (0.1) (1.5)
Fair value, twelve months or greater 92.2 69.5
Gross unrealized losses, twelve months or greater (4.8) (4.6)
Fair value, total 102.8 131.1
Gross unrealized losses, total (4.9) (6.1)
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Fair value, less than twelve months 59.1 103.3
Gross unrealized losses, less than twelve months (0.8) (1.3)
Fair value, twelve months or greater 224.7 254.6
Gross unrealized losses, twelve months or greater (10.4) (12.7)
Fair value, total 283.8 357.9
Gross unrealized losses, total (11.2) (14.0)
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Fair value, less than twelve months 30.8 189.0
Gross unrealized losses, less than twelve months (0.1) (5.3)
Fair value, twelve months or greater 871.7 784.8
Gross unrealized losses, twelve months or greater (38.7) (42.5)
Fair value, total 902.5 973.8
Gross unrealized losses, total (38.8) (47.8)
Municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Fair value, less than twelve months 0.0 0.0
Gross unrealized losses, less than twelve months 0.0 0.0
Fair value, twelve months or greater 2.6 2.5
Gross unrealized losses, twelve months or greater (0.2) (0.2)
Fair value, total 2.6 2.5
Gross unrealized losses, total $ (0.2) $ (0.2)