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INVESTMENTS - Cost and Fair Value of Investments in Debt Securities, by Contractual Maturity (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Amortized Cost    
Due in 1 year or less $ 23.5  
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 28.0  
Fair Value    
Due in 1 year or less 23.5  
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 28.0  
Amortized Cost    
Due in 1 year or less 366.5  
Due after 1 year through 5 years 647.3  
Due after 5 years through 10 years 5.2  
Instruments not due at a single maturity date 345.4  
Amortized Cost 1,364.4 $ 1,549.1
Fair Value    
Due in 1 year or less 358.2  
Due after 1 year through 5 years 614.8  
Due after 5 years through 10 years 5.1  
Instruments not due at a single maturity date 331.2  
Fair Value $ 1,309.3 $ 1,481.0