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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, 2020	Dec. 31, 2019
Amortized Cost
Due in 1 year or less	$ 50.0
Due after 1 year through 5 years	0.0
Instruments not due at a single maturity date	0.0
Amortized Cost	50.0
Fair Value
Due in 1 year or less	50.0
Due after 1 year through 5 years	0.0
Instruments not due at a single maturity date	0.0
Total	50.0
Amortized Cost
Due in 1 year or less	168.4
Due after 1 year through 5 years	578.2
Instruments not due at a single maturity date	177.7
Amortized Cost	924.3	$ 790.5
Fair Value
Due in 1 year or less	169.4
Due after 1 year through 5 years	586.5
Instruments not due at a single maturity date	180.0
Total	$ 935.9	$ 793.8

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