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FINANCIAL INSTRUMENTS - Summary of Contractual Maturities of Cash Equivalents and Available-For-Sale Investments (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)
Amortized Cost
Mature in less than one year	$ 2,645.5	$ 2,645.5
Mature in one to five years	1,542.8	1,542.8
Total	4,188.3	4,188.3
Fair Value
Mature in less than one year	2,658.9	2,658.9
Mature in one to five years	1,586.5	1,586.5
Total	4,245.4	4,245.4
Realized Investment Gains (Losses)	$ 6.9	$ 8.3

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