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FINANCIAL INSTRUMENTS - Summary of Cash and Available-For-Sale Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents $ 969.6 $ 857.9
Total 4,435.6  
Total assets measured at fair value, Amortized Cost 5,402.2 4,845.0
Gross Unrealized Gains 29.9 3.3
Gross Unrealized Losses (1.5) (13.9)
Total assets measured at fair value, Fair Value 5,430.6 4,834.4
Short- term Investments 1,928.0 2,205.2
Long- term Investments 2,533.0 1,771.3
Cash    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 325.2 269.4
Fair Value 325.2 269.4
Level 1    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 641.4 579.1
Total 2,488.3 2,046.9
Gross Unrealized Gains 10.6 1.7
Gross Unrealized Losses (0.7) (5.3)
Fair Value 2,498.2 2,043.3
Short- term Investments 932.8 897.8
Long- term Investments 924.0 566.4
Level 1 | Money market funds    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 641.4 569.1
Fair Value 641.4 569.1
Short- term Investments 0.0 0.0
Long- term Investments 0.0 0.0
Level 1 | U.S. treasuries    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 10.0
Total 1,846.9 1,477.8
Gross Unrealized Gains 10.6 1.7
Gross Unrealized Losses (0.7) (5.3)
Fair Value 1,856.8 1,474.2
Short- term Investments 932.8 897.8
Long- term Investments 924.0 566.4
Level 2    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 3.0 9.4
Total 2,588.7 2,528.7
Gross Unrealized Gains 19.3 1.6
Gross Unrealized Losses (0.8) (8.6)
Fair Value 2,607.2 2,521.7
Short- term Investments 995.2 1,307.4
Long- term Investments 1,609.0 1,204.9
Level 2 | Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 3.0 1.4
Total 117.5 110.7
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Fair Value 117.5 110.7
Short- term Investments 114.5 109.3
Long- term Investments 0.0 0.0
Level 2 | Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 8.0
Total 1,958.9 1,607.8
Gross Unrealized Gains 18.0 1.3
Gross Unrealized Losses (0.4) (4.8)
Fair Value 1,976.5 1,604.3
Short- term Investments 637.0 724.5
Long- term Investments 1,339.5 871.8
Level 2 | U.S. government agencies    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 481.1 791.8
Gross Unrealized Gains 1.0 0.3
Gross Unrealized Losses (0.4) (3.8)
Fair Value 481.7 788.3
Short- term Investments 227.9 468.9
Long- term Investments 253.8 319.4
Level 2 | Municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 31.2 18.4
Gross Unrealized Gains 0.3 0.0
Gross Unrealized Losses 0.0 0.0
Fair Value 31.5 18.4
Short- term Investments 15.8 4.7
Long- term Investments $ 15.7 13.7
Prepaids and other current assets    
Debt Securities, Available-for-sale [Line Items]    
Restricted cash equivalents   $ 36.5