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INVESTMENTS - Schedule of Gross Unrealized Losses and Fair Values for Investments in Unrealized Loss Position (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]    
Fair value, less than 12 months $ 11.3 $ 8.4
Gross unrealized losses, less than 12 months (0.1) (0.1)
Fair value, 12 months or greater 90.4 214.2
Gross unrealized losses, 12 months or greater (1.9) (5.2)
Fair value, total 101.7 222.6
Gross unrealized losses, total (2.0) (5.3)
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 12.7 19.9
Gross unrealized losses, 12 months or greater (0.5) (1.1)
Fair value, total 12.7 19.9
Gross unrealized losses, total (0.5) (1.1)
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Fair value, less than 12 months 11.3 8.4
Gross unrealized losses, less than 12 months (0.1) (0.1)
Fair value, 12 months or greater 29.7 53.3
Gross unrealized losses, 12 months or greater (0.7) (1.3)
Fair value, total 41.0 61.7
Gross unrealized losses, total (0.8) (1.4)
Corporate debt 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 48.0 141.0
Gross unrealized losses, 12 months or greater (0.7) (2.8)
Fair value, total 48.0 141.0
Gross unrealized losses, total $ (0.7) $ (2.8)