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FINANCIAL INSTRUMENTS - Summary of Contractual Maturities of Cash Equivalents and Available-For-Sale Investments (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2021
Amortized Cost
Mature in less than one year		$ 2,735.3
Mature in one to five years		4,125.6
Total		6,860.9
Fair Value
Mature in less than one year		2,741.5
Mature in one to five years		4,131.5
Total		$ 6,873.0
Realized investment gains (losses)	$ 8.3

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