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FINANCIAL INSTRUMENTS - Summary of Cash and Available-For-Sale Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents $ 790.3 $ 857.9
Total 4,342.7  
Total assets measured at fair value, Amortized Cost 5,122.0 4,845.0
Gross Unrealized Gains 28.2 3.3
Gross Unrealized Losses (2.0) (13.9)
Total assets measured at fair value, Fair Value 5,148.2 4,834.4
Short- term Investments 1,928.1 2,205.2
Long- term Investments 2,429.8 1,771.3
Cash    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 264.0 269.4
Fair Value 264.0 269.4
Level 1    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 526.3 579.1
Total 2,253.1 2,046.9
Gross Unrealized Gains 10.3 1.7
Gross Unrealized Losses (0.9) (5.3)
Fair Value 2,262.5 2,043.3
Short- term Investments 892.0 897.8
Long- term Investments 844.2 566.4
Level 1 | Money market funds    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 515.3 569.1
Fair Value 515.3 569.1
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 11.0 10.0
Total 1,737.8 1,477.8
Gross Unrealized Gains 10.3 1.7
Gross Unrealized Losses (0.9) (5.3)
Fair Value 1,747.2 1,474.2
Short- term Investments 892.0 897.8
Long- term Investments 844.2 566.4
Level 2    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 9.4
Total 2,604.9 2,528.7
Gross Unrealized Gains 17.9 1.6
Gross Unrealized Losses (1.1) (8.6)
Fair Value 2,621.7 2,521.7
Short- term Investments 1,036.1 1,307.4
Long- term Investments 1,585.6 1,204.9
Level 2 | Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 1.4
Total 83.1 110.7
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Fair Value 83.1 110.7
Short- term Investments 83.1 109.3
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 1,910.4 1,607.8
Gross Unrealized Gains 16.5 1.3
Gross Unrealized Losses (0.5) (4.8)
Fair Value 1,926.4 1,604.3
Short- term Investments 647.9 724.5
Long- term Investments 1,278.5 871.8
Level 2 | U.S. government agencies    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 584.6 791.8
Gross Unrealized Gains 1.1 0.3
Gross Unrealized Losses (0.6) (3.8)
Fair Value 585.1 788.3
Short- term Investments 289.2 468.9
Long- term Investments 295.9 319.4
Level 2 | Municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 26.8 18.4
Gross Unrealized Gains 0.3 0.0
Gross Unrealized Losses 0.0 0.0
Fair Value 27.1 18.4
Short- term Investments 15.9 4.7
Long- term Investments $ 11.2 13.7
Prepaids and other current assets    
Debt Securities, Available-for-sale [Line Items]    
Restricted cash equivalents   $ 36.5