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FINANCIAL INSTRUMENTS - Summary of Contractual Maturities of Cash Equivalents and Available-For-Sale Investments (Details) $ in Millions	Jun. 30, 2019 USD ($)
Amortized Cost
Mature in less than one year	$ 1,949.8
Mature in one to five years	2,389.9
Mature in more than five years	3.0
Total	4,342.7
Fair Value
Mature in less than one year	1,952.1
Mature in one to five years	2,413.8
Mature in more than five years	3.0
Total	$ 4,368.9

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