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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, 2021	Dec. 31, 2020
Amortized Cost
Due in 1 year or less	$ 83.0
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
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss	83.0
Fair Value
Due in 1 year or less	83.0
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	83.0
Amortized Cost
Due in 1 year or less	203.6
Due after 1 year through 5 years	839.0
Due after 5 years through 10 years	4.9
Instruments not due at a single maturity date	353.2
Amortized Cost	1,400.7	$ 924.3
Fair Value
Due in 1 year or less	204.8
Due after 1 year through 5 years	841.5
Due after 5 years through 10 years	4.9
Instruments not due at a single maturity date	353.6
Fair Value	$ 1,404.8	$ 935.9

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