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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, 2023	Dec. 31, 2022
Amortized Cost
Due in 1 year or less	$ 64.5
Due after 1 year through 5 years	0.0
Due after 10 years	0.0
Instruments not due at a single maturity date	0.0
Amortized Cost	64.5
Fair Value
Due in 1 year or less	64.5
Due after 1 year through 5 years	0.0
Due after 10 years	0.0
Instruments not due at a single maturity date	0.0
Fair Value	64.5
Amortized Cost
Due in 1 year or less	443.2
Due after 1 year through 5 years	267.8
Due after 10 years	0.9
Instruments not due at a single maturity date	214.2
Amortized Cost	926.1	$ 1,549.1
Fair Value
Due in 1 year or less	436.0
Due after 1 year through 5 years	257.0
Due after 10 years	0.9
Instruments not due at a single maturity date	204.8
Fair Value	$ 898.7	$ 1,481.0

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