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INVESTMENTS - Cost and Fair Value of Investments in Debt Securities, by Contractual Maturity (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Amortized Cost
Due in 1 year or less	$ 160.0
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	160.0
Fair Value
Due in 1 year or less	160.0
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	160.0
Amortized Cost
Due in 1 year or less	305.9
Due after 1 year through 5 years	1,070.8
Due after 5 years through 10 years	8.1
Instruments not due at a single maturity date (a)	503.6
Amortized Cost	1,888.4	$ 2,192.7
Fair Value
Due in 1 year or less	305.0
Due after 1 year through 5 years	1,033.4
Due after 5 years through 10 years	7.8
Instruments not due at a single maturity date (a)	490.4
Fair Value	$ 1,836.6	$ 2,183.7

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