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Financial Instruments - Summary Of Contractual Maturities Of Cash Equivalents And Available-For-Sale Investments (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Amortized Cost  
Mature in less than one year $ 2,230.2
Mature in one to five years 1,776.3
Total 4,006.5
Fair Value  
Mature in less than one year 2,224.6
Mature in one to five years 1,771.3
Total $ 3,995.9