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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, 2024	Dec. 31, 2023
Amortized Cost
Due in 1 year or less	$ 50.5
Due after 1 year through 5 years	0.0
Instruments not due at a single maturity date	0.0
Amortized Cost	50.5
Fair Value
Due in 1 year or less	50.5
Due after 1 year through 5 years	0.0
Instruments not due at a single maturity date	0.0
Fair Value	50.5
Amortized Cost
Due in 1 year or less	721.1
Due after 1 year through 5 years	81.4
Instruments not due at a single maturity date	98.4
Amortized Cost	900.9	$ 926.1
Fair Value
Due in 1 year or less	719.2
Due after 1 year through 5 years	79.2
Instruments not due at a single maturity date	95.8
Fair Value	$ 894.2	$ 898.7

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