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INVESTMENTS - Schedule of Gross Unrealized Losses and Fair Values for Investments in Unrealized Loss Position (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Fair value, less than 12 months $ 5.1 $ 35.2
Gross unrealized losses, less than 12 months (0.1) (1.9)
Fair value, 12 months or greater 432.7 843.7
Gross unrealized losses, 12 months or greater (12.7) (25.6)
Fair value, total 437.8 878.9
Gross unrealized losses, total (12.8) (27.5)
U.S. government and agency 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 44.8 67.1
Gross unrealized losses, 12 months or greater (2.0) (2.8)
Fair value, total 44.8 67.1
Gross unrealized losses, total (2.0) (2.8)
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Fair value, less than 12 months 5.1 10.2
Gross unrealized losses, less than 12 months (0.1) (1.8)
Fair value, 12 months or greater 101.8 172.7
Gross unrealized losses, 12 months or greater (2.6) (6.0)
Fair value, total 106.9 182.9
Gross unrealized losses, total (2.7) (7.8)
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Fair value, less than 12 months 0.0 25.0
Gross unrealized losses, less than 12 months 0.0 (0.1)
Fair value, 12 months or greater 283.4 601.3
Gross unrealized losses, 12 months or greater (8.0) (16.6)
Fair value, total 283.4 626.3
Gross unrealized losses, total (8.0) (16.7)
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 2.7 2.6
Gross unrealized losses, 12 months or greater (0.1) (0.2)
Fair value, total 2.7 2.6
Gross unrealized losses, total $ (0.1) $ (0.2)