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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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