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FINANCIAL INSTRUMENTS - Summary of Cash and Available-For-Sale Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 4,089.0 $ 3,861.7
Gross Unrealized Gains 0.2 0.2
Gross Unrealized Losses (21.0) (15.4)
Fair Value 4,068.2 3,846.5
Cash and Cash Equivalents 974.7 648.2
Short- term Investments 1,542.6 1,312.4
Long- term Investments 1,550.9 1,885.9
Cash    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 257.9 197.7
Fair Value 257.9 197.7
Cash and Cash Equivalents 257.9 197.7
Level 1    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,753.3 1,474.1
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses (7.8) (4.7)
Fair Value 1,745.5 1,469.4
Cash and Cash Equivalents 619.6 450.5
Short- term Investments 560.2 396.2
Long- term Investments 565.7 622.7
Level 1 | Money market funds    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 593.0 445.0
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Fair Value 593.0 445.0
Cash and Cash Equivalents 593.0 445.0
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]    
Amortized Cost 1,160.3 1,029.1
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses (7.8) (4.7)
Fair Value 1,152.5 1,024.4
Cash and Cash Equivalents 26.6 5.5
Short- term Investments 560.2 396.2
Long- term Investments 565.7 622.7
Level 2    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 2,077.8 2,189.9
Gross Unrealized Gains 0.2 0.2
Gross Unrealized Losses (13.2) (10.7)
Fair Value 2,064.8 2,179.4
Cash and Cash Equivalents 97.2 0.0
Short- term Investments 982.4 916.2
Long- term Investments 985.2 1,263.2
Level 2 | Commercial paper    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 96.2 38.4
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Fair Value 96.2 38.4
Cash and Cash Equivalents 62.7 0.0
Short- term Investments 33.5 38.4
Long- term Investments 0.0 0.0
Level 2 | Corporate debt securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 988.4 946.6
Gross Unrealized Gains 0.1 0.2
Gross Unrealized Losses (7.0) (4.4)
Fair Value 981.5 942.4
Cash and Cash Equivalents 0.0 0.0
Short- term Investments 499.5 403.9
Long- term Investments 482.0 538.5
Level 2 | U.S. government agencies    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 939.1 901.3
Gross Unrealized Gains 0.1 0.0
Gross Unrealized Losses (6.2) (4.4)
Fair Value 933.0 896.9
Cash and Cash Equivalents 34.5 0.0
Short- term Investments 395.3 311.7
Long- term Investments 503.2 585.2
Level 2 | Non-U.S. government securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 2.5 2.5
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Fair Value 2.5 2.5
Cash and Cash Equivalents 0.0 0.0
Short- term Investments 2.5 2.5
Long- term Investments 0.0 0.0
Level 2 | Municipal securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 51.6 301.1
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 (1.9)
Fair Value 51.6 299.2
Cash and Cash Equivalents 0.0 0.0
Short- term Investments 51.6 159.7
Long- term Investments $ 0.0 $ 139.5