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FINANCIAL INSTRUMENTS - Summary of Cash and Available-For-Sale Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Cash and cash equivalents $ 1,008.3 $ 648.2
Total 3,592.8  
Total assets measured at fair value, Amortized Cost 4,589.6 3,861.7
Gross Unrealized Gains 0.4 0.2
Gross Unrealized Losses (19.5) (15.4)
Total assets measured at fair value, Fair Value 4,570.5 3,846.5
Short- term Investments 2,127.6 1,312.4
Long- term Investments 1,434.6 1,885.9
Cash    
Schedule of Available-for-sale Securities [Line Items]    
Cash and cash equivalents 260.6 197.7
Fair Value 260.6 197.7
Level 1    
Schedule of Available-for-sale Securities [Line Items]    
Cash and cash equivalents 736.2 450.5
Total 1,995.4 1,474.1
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses (8.3) (4.7)
Fair Value 1,987.1 1,469.4
Short- term Investments 806.6 396.2
Long- term Investments 444.3 622.7
Level 1 | Money market funds    
Schedule of Available-for-sale Securities [Line Items]    
Cash and cash equivalents 736.2 445.0
Fair Value 736.2 445.0
Short- term Investments 0.0 0.0
Long- term Investments 0.0 0.0
Level 1 | U.S. treasuries    
Schedule of Available-for-sale Securities [Line Items]    
Cash and cash equivalents 0.0 5.5
Total 1,259.2 1,029.1
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses (8.3) (4.7)
Fair Value 1,250.9 1,024.4
Short- term Investments 806.6 396.2
Long- term Investments 444.3 622.7
Level 2    
Schedule of Available-for-sale Securities [Line Items]    
Cash and cash equivalents 11.5 0.0
Total 2,333.6 2,189.9
Gross Unrealized Gains 0.4 0.2
Gross Unrealized Losses (11.2) (10.7)
Fair Value 2,322.8 2,179.4
Short- term Investments 1,321.0 916.2
Long- term Investments 990.3 1,263.2
Level 2 | Commercial paper    
Schedule of Available-for-sale Securities [Line Items]    
Cash and cash equivalents 11.5 0.0
Total 146.4 38.4
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Fair Value 146.4 38.4
Short- term Investments 134.9 38.4
Long- term Investments 0.0 0.0
Level 2 | Corporate debt securities    
Schedule of Available-for-sale Securities [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 1,354.8 946.6
Gross Unrealized Gains 0.4 0.2
Gross Unrealized Losses (5.2) (4.4)
Fair Value 1,350.0 942.4
Short- term Investments 692.4 403.9
Long- term Investments 657.6 538.5
Level 2 | U.S. government agencies    
Schedule of Available-for-sale Securities [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 819.5 901.3
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses (6.0) (4.4)
Fair Value 813.5 896.9
Short- term Investments 493.7 311.7
Long- term Investments 319.8 585.2
Level 2 | Non-U.S. government securities    
Schedule of Available-for-sale Securities [Line Items]    
Cash and cash equivalents   0.0
Total   2.5
Gross Unrealized Gains   0.0
Gross Unrealized Losses   0.0
Fair Value   2.5
Short- term Investments   2.5
Long- term Investments   0.0
Level 2 | Municipal securities    
Schedule of Available-for-sale Securities [Line Items]    
Cash and cash equivalents 0.0 0.0
Total 12.9 301.1
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 (1.9)
Fair Value 12.9 299.2
Short- term Investments 0.0 159.7
Long- term Investments $ 12.9 $ 139.5