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INVESTMENTS - Cost and Fair Value of Investments in Debt Securities, by Contractual Maturity (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Amortized Cost    
Due in 1 year or less $ 62.5  
Due after 1 year through 5 years 2.7  
Due after 5 years through 10 years 0.0  
Instruments not due at a single maturity date 0.0  
Amortized Cost 65.2  
Fair Value    
Due in 1 year or less 62.5  
Due after 1 year through 5 years 2.7  
Due after 5 years through 10 years 0.0  
Instruments not due at a single maturity date 0.0  
Fair Value 65.2  
Amortized Cost    
Due in 1 year or less 258.2  
Due after 1 year through 5 years 974.4  
Due after 5 years through 10 years 7.3  
Instruments not due at a single maturity date 471.1  
Amortized Cost 1,711.0 $ 2,192.7
Fair Value    
Due in 1 year or less 255.2  
Due after 1 year through 5 years 926.7  
Due after 5 years through 10 years 7.0  
Instruments not due at a single maturity date 454.5  
Fair Value $ 1,643.4 $ 2,183.7