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Financial Instruments - Summary Of Cash And Available-For-Sale Securities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]    
Cash and Cash Equivalents $ 1,622.6 $ 1,167.6
Total 5,559.8  
Total assets measured at fair value, Amortized Cost 6,829.9 5,818.1
Gross Unrealized Gains 39.4 27.9
Gross Unrealized Losses 0.2 0.8
Fair Value 5,599.0  
Total assets measured at fair value, Fair Value 6,869.1 5,845.2
Short-term Investments 3,488.8 2,054.1
Long-term Investments 1,757.7 2,623.5
Cash    
Schedule of Available-for-sale Securities [Line Items]    
Cash and Cash Equivalents 644.3 413.1
Fair Value 644.3 413.1
Level 1    
Schedule of Available-for-sale Securities [Line Items]    
Cash and Cash Equivalents 838.3 726.8
Total 3,252.6 2,662.6
Gross Unrealized Gains 23.0 9.7
Gross Unrealized Losses 0.0 0.4
Fair Value 3,275.6 2,671.9
Short-term Investments 1,567.9 890.8
Long-term Investments 869.4 1,054.3
Level 1 | Money market funds    
Schedule of Available-for-sale Securities [Line Items]    
Cash and Cash Equivalents 625.8 726.8
Fair Value 625.8 726.8
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 212.5 0.0
Total 2,626.8 1,935.8
Gross Unrealized Gains 23.0 9.7
Gross Unrealized Losses 0.0 0.4
Fair Value 2,649.8 1,945.1
Short-term Investments 1,567.9 890.8
Long-term Investments 869.4 1,054.3
Level 2    
Schedule of Available-for-sale Securities [Line Items]    
Cash and Cash Equivalents 140.0 27.7
Total 2,933.0 2,742.4
Gross Unrealized Gains 16.4 18.2
Gross Unrealized Losses 0.2 0.4
Fair Value 2,949.2 2,760.2
Short-term Investments 1,920.9 1,163.3
Long-term Investments 888.3 1,569.2
Level 2 | Commercial paper    
Schedule of Available-for-sale Securities [Line Items]    
Cash and Cash Equivalents 64.1 25.5
Total 671.3 165.1
Gross Unrealized Gains 0.0 0.0
Gross Unrealized Losses 0.0 0.0
Fair Value 671.3 165.1
Short-term Investments 607.2 139.6
Long-term Investments 0.0 0.0
Level 2 | Corporate securities    
Schedule of Available-for-sale Securities [Line Items]    
Cash and Cash Equivalents 3.4 0.0
Total 1,425.4 2,096.1
Gross Unrealized Gains 11.9 16.8
Gross Unrealized Losses 0.2 0.2
Fair Value 1,437.1 2,112.7
Short-term Investments 1,036.5 798.5
Long-term Investments 397.2 1,314.2
Level 2 | U.S. government agencies    
Schedule of Available-for-sale Securities [Line Items]    
Cash and Cash Equivalents 72.5 0.0
Total 716.5 418.3
Gross Unrealized Gains 2.5 1.1
Gross Unrealized Losses 0.0 0.2
Fair Value 719.0 419.2
Short-term Investments 233.6 209.6
Long-term Investments 412.9 209.6
Level 2 | Non-U.S. government securities    
Schedule of Available-for-sale Securities [Line Items]    
Cash and Cash Equivalents   0.0
Total   4.5
Gross Unrealized Gains   0.0
Gross Unrealized Losses   0.0
Fair Value   4.5
Short-term Investments   4.5
Long-term Investments   0.0
Level 2 | Municipal securities    
Schedule of Available-for-sale Securities [Line Items]    
Cash and Cash Equivalents 0.0 2.2
Total 119.8 58.4
Gross Unrealized Gains 2.0 0.3
Gross Unrealized Losses 0.0 0.0
Fair Value 121.8 58.7
Short-term Investments 43.6 11.1
Long-term Investments $ 78.2 $ 45.4