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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, 2026
Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]    
Fair value, less than 12 months $ 841.7 $ 81.8
Gross unrealized losses, less than 12 months (0.7) (0.2)
Fair value, 12 months or greater 44.1 69.8
Gross unrealized losses, 12 months or greater (0.8) (1.2)
Fair value, total 885.8 151.6
Gross unrealized losses, total (1.5) (1.4)
U.S. government and agency securities    
Debt Securities, Available-for-sale [Line Items]    
Fair value, less than 12 months 241.9 0.0
Gross unrealized losses, less than 12 months (0.1) 0.0
Fair value, 12 months or greater 8.0 11.2
Gross unrealized losses, 12 months or greater (0.3) (0.4)
Fair value, total 249.9 11.2
Gross unrealized losses, total (0.4) (0.4)
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Fair value, less than 12 months 13.2 5.1
Gross unrealized losses, less than 12 months (0.1) (0.1)
Fair value, 12 months or greater 20.8 24.3
Gross unrealized losses, 12 months or greater (0.4) (0.5)
Fair value, total 34.0 29.4
Gross unrealized losses, total (0.5) (0.6)
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Fair value, less than 12 months 586.6 76.7
Gross unrealized losses, less than 12 months (0.5) (0.1)
Fair value, 12 months or greater 15.3 34.3
Gross unrealized losses, 12 months or greater (0.1) (0.3)
Fair value, total 601.9 111.0
Gross unrealized losses, total $ (0.6) $ (0.4)