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Financial Instruments - Summary Of Cash And Available-For-Sale Securities (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Cash and Cash Equivalents | $ 1,167.6 | $ 857.9
Total | 4,678.2 |
Total assets measured at fair value, Amortized Cost | 5,818.1 | 4,845.0
Gross Unrealized Gains | 27.9 | 3.3
Gross Unrealized Losses | 0.8 | 13.9
Fair Value | 4,705.3 |
Total assets measured at fair value, Fair Value | 5,845.2 | 4,834.4
Short-term Investments | 2,054.1 | 2,205.2
Long-term Investments | 2,623.5 | 1,771.3
Cash |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cash and Cash Equivalents | 413.1 | 269.4
Fair Value | 413.1 | 269.4
Level 1 |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cash and Cash Equivalents | 726.8 | 579.1
Total | 2,662.6 | 2,046.9
Gross Unrealized Gains | 9.7 | 1.7
Gross Unrealized Losses | 0.4 | 5.3
Fair Value | 2,671.9 | 2,043.3
Short-term Investments | 890.8 | 897.8
Long-term Investments | 1,054.3 | 566.4
Level 1 | Money market funds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cash and Cash Equivalents | 726.8 | 569.1
Fair Value | 726.8 | 569.1
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 | 10.0
Total | 1,935.8 | 1,477.8
Gross Unrealized Gains | 9.7 | 1.7
Gross Unrealized Losses | 0.4 | 5.3
Fair Value | 1,945.1 | 1,474.2
Short-term Investments | 890.8 | 897.8
Long-term Investments | 1,054.3 | 566.4
Level 2 |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cash and Cash Equivalents | 27.7 | 9.4
Total | 2,742.4 | 2,528.7
Gross Unrealized Gains | 18.2 | 1.6
Gross Unrealized Losses | 0.4 | 8.6
Fair Value | 2,760.2 | 2,521.7
Short-term Investments | 1,163.3 | 1,307.4
Long-term Investments | 1,569.2 | 1,204.9
Level 2 | Commercial paper |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cash and Cash Equivalents | 25.5 | 1.4
Total | 165.1 | 110.7
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
Fair Value | 165.1 | 110.7
Short-term Investments | 139.6 | 109.3
Long-term Investments | 0.0 | 0.0
Level 2 | Corporate securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cash and Cash Equivalents | 0.0 | 8.0
Total | 2,096.1 | 1,607.8
Gross Unrealized Gains | 16.8 | 1.3
Gross Unrealized Losses | 0.2 | 4.8
Fair Value | 2,112.7 | 1,604.3
Short-term Investments | 798.5 | 724.5
Long-term Investments | 1,314.2 | 871.8
Level 2 | U.S. government agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cash and Cash Equivalents | 0.0 | 0.0
Total | 418.3 | 791.8
Gross Unrealized Gains | 1.1 | 0.3
Gross Unrealized Losses | 0.2 | 3.8
Fair Value | 419.2 | 788.3
Short-term Investments | 209.6 | 468.9
Long-term Investments | 209.6 | 319.4
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 | 2.2 | 0.0
Total | 58.4 | 18.4
Gross Unrealized Gains | 0.3 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
Fair Value | 58.7 | 18.4
Short-term Investments | 11.1 | 4.7
Long-term Investments | $ 45.4 | $ 13.7

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