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FINANCIAL INSTRUMENTS - Summary of Contractual Maturities of Cash Equivalents and Available-For-Sale Investments (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2021
Amortized Cost
Mature in less than one year			$ 2,846.5
Mature in one to five years			3,285.1
Total			6,131.6
Fair Value
Mature in less than one year			2,853.9
Mature in one to five years			3,295.6
Total			$ 6,149.5
Realized Investment Gains (Losses)	$ 6.9	$ 8.3

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