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INVESTMENTS - Schedule of Cost and Fair Value of Investments in Debt Securities, by Contractual Maturity (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Amortized Cost    
Due in 1 year or less $ 28.0  
Due after 1 year through 5 years 0.0  
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 28.0  
Due after 1 year through 5 years 0.0  
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 435.8  
Due after 1 year through 5 years 365.3  
Due after 5 years through 10 years 0.0  
Instruments not due at a single maturity date 258.1  
Amortized Cost 1,059.2 $ 1,549.1
Fair Value    
Due in 1 year or less 425.8  
Due after 1 year through 5 years 347.1  
Due after 5 years through 10 years 0.0  
Instruments not due at a single maturity date 247.7  
Fair Value $ 1,020.6 $ 1,481.0