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INVESTMENTS - Cost and Fair Value of Investments in Debt Securities, by Contractual Maturity (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Amortized Cost    
Due in 1 year or less $ 118.5  
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 123.0  
Fair Value    
Due in 1 year or less 118.5  
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 123.0  
Amortized Cost    
Due in 1 year or less 379.3  
Due after 1 year through 5 years 840.7  
Due after 5 years through 10 years 6.6  
Instruments not due at a single maturity date 491.4  
Amortized Cost 1,718.0 $ 2,192.7
Fair Value    
Due in 1 year or less 372.4  
Due after 1 year through 5 years 789.0  
Due after 5 years through 10 years 6.3  
Instruments not due at a single maturity date 472.3  
Fair Value $ 1,640.0 $ 2,183.7