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INVESTMENTS - Schedule of Cost and Fair Value of Investments in Debt Securities, by Contractual Maturity (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Amortized Cost    
Due in 1 year or less $ 91.5  
Due after 1 year through 5 years 4.5  
Due after 5 years through 10 years 0.0  
Instruments not due at a single maturity date 0.0  
Amortized Cost 96.0  
Fair Value    
Due in 1 year or less 91.5  
Due after 1 year through 5 years 4.5  
Due after 5 years through 10 years 0.0  
Instruments not due at a single maturity date 0.0  
Fair Value 96.0  
Amortized Cost    
Due in 1 year or less 362.0  
Due after 1 year through 5 years 753.8  
Due after 5 years through 10 years 6.0  
Instruments not due at a single maturity date 427.3  
Amortized Cost 1,549.1 $ 2,192.7
Fair Value    
Due in 1 year or less 354.8  
Due after 1 year through 5 years 710.8  
Due after 5 years through 10 years 5.7  
Instruments not due at a single maturity date 409.7  
Fair Value $ 1,481.0 $ 2,183.7