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INVESTMENTS - Schedule of Cost and Fair Value of Investments in Debt Securities, by Contractual Maturity (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Amortized Cost    
Due in 1 year or less $ 39.0  
Instruments not due at a single maturity date 0.0  
Amortized Cost 39.0  
Fair Value    
Due in 1 year or less 39.0  
Instruments not due at a single maturity date 0.0  
Fair Value 39.0  
Amortized Cost    
Due in 1 year or less 1,307.8  
Instruments not due at a single maturity date 43.7  
Amortized Cost 1,351.5 $ 1,301.6
Fair Value    
Due in 1 year or less 1,307.2  
Instruments not due at a single maturity date 42.8  
Fair Value $ 1,350.0 $ 1,300.5