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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, 2021	Dec. 31, 2020
Amortized Cost
Due in 1 year or less	$ 162.0
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 (a)	0.0
Amortized Cost	162.0
Fair Value
Due in 1 year or less	162.0
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 (a)	0.0
Fair Value	162.0
Amortized Cost
Due in 1 year or less	441.3
Due after 1 year through 5 years	1,196.7
Due after 5 years through 10 years	8.7
Instruments not due at a single maturity date (a)	546.0
Amortized Cost	2,192.7	$ 924.3
Fair Value
Due in 1 year or less	442.0
Due after 1 year through 5 years	1,189.6
Due after 5 years through 10 years	8.6
Instruments not due at a single maturity date (a)	543.5
Fair Value	$ 2,183.7	$ 935.9

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