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FINANCIAL INSTRUMENTS - Summary of Contractual Maturities of Cash Equivalents and Available-For-Sale Investments (Details)
$ in Millions
9 Months Ended
Sep. 30, 2020
USD ($)
Amortized Cost  
Mature in less than one year $ 3,452.0
Mature in one to five years 1,606.2
Total 5,058.2
Fair Value  
Mature in less than one year 3,464.0
Mature in one to five years 1,643.2
Total 5,107.2
Realized Investment Gains (Losses) $ 8.3