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Financial Instruments - Summary Of Cash And Available-For-Sale Securities (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Cash and Cash Equivalents $ 857.9 $ 648.2
Total 4,006.5  
Total assets measured at fair value, Amortized Cost 4,845.0 3,861.7
Gross Unrealized Gains 3.3 0.2
Gross Unrealized Losses 13.9 15.4
Fair Value 3,995.9  
Total assets measured at fair value, Fair Value 4,834.4 3,846.5
Short-term Investments 2,205.2 1,312.4
Long-term Investments 1,771.3 1,885.9
Cash    
Schedule of Available-for-sale Securities [Line Items]    
Cash and Cash Equivalents 269.4 197.7
Fair Value 269.4 197.7
Level 1    
Schedule of Available-for-sale Securities [Line Items]    
Cash and Cash Equivalents 579.1 450.5
Total 2,046.9 1,474.1
Gross Unrealized Gains 1.7 0.0
Gross Unrealized Losses 5.3 4.7
Fair Value 2,043.3 1,469.4
Short-term Investments 897.8 396.2
Long-term Investments 566.4 622.7
Level 1 | Money market funds    
Schedule of Available-for-sale Securities [Line Items]    
Cash and Cash Equivalents 569.1 445.0
Fair Value 569.1 445.0
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 10.0 5.5
Total 1,477.8 1,029.1
Gross Unrealized Gains 1.7 0.0
Gross Unrealized Losses 5.3 4.7
Fair Value 1,474.2 1,024.4
Short-term Investments 897.8 396.2
Long-term Investments 566.4 622.7
Level 2    
Schedule of Available-for-sale Securities [Line Items]    
Cash and Cash Equivalents 9.4 0.0
Total 2,528.7 2,189.9
Gross Unrealized Gains 1.6 0.2
Gross Unrealized Losses 8.6 10.7
Fair Value 2,521.7 2,179.4
Short-term Investments 1,307.4 916.2
Long-term Investments 1,204.9 1,263.2
Level 2 | Commercial paper    
Schedule of Available-for-sale Securities [Line Items]    
Cash and Cash Equivalents 1.4 0.0
Total 110.7 38.4
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Fair Value 110.7 38.4
Short-term Investments 109.3 38.4
Long-term Investments 0.0 0.0
Level 2 | Corporate securities    
Schedule of Available-for-sale Securities [Line Items]    
Cash and Cash Equivalents 8.0 0.0
Total 1,607.8 946.6
Gross Unrealized Gains 1.3 0.2
Gross Unrealized Losses 4.8 4.4
Fair Value 1,604.3 942.4
Short-term Investments 724.5 403.9
Long-term Investments 871.8 538.5
Level 2 | U.S. government agencies    
Schedule of Available-for-sale Securities [Line Items]    
Cash and Cash Equivalents 0.0 0.0
Total 791.8 901.3
Gross Unrealized Gains 0.3 0.0
Gross Unrealized Losses 3.8 4.4
Fair Value 788.3 896.9
Short-term Investments 468.9 311.7
Long-term Investments 319.4 585.2
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 18.4 301.1
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 1.9
Fair Value 18.4 299.2
Short-term Investments 4.7 159.7
Long-term Investments $ 13.7 $ 139.5