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FINANCIAL INSTRUMENTS - Summary of Contractual Maturities of Cash Equivalents and Available-For-Sale Investments (Details)
$ in Millions
Mar. 31, 2018
USD ($)
Amortized Cost  
Mature in less than one year $ 1,671.7
Mature in one to five years 1,566.4
Total 3,238.1
Fair Value  
Mature in less than one year 1,666.4
Mature in one to five years 1,550.9
Total $ 3,217.3