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Financial Instruments - Summary Of Cash And Available-For-Sale Securities (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Cash and Cash Equivalents | $ 1,290.9 | $ 1,622.6
Total | 7,371.9 |
Total assets measured at fair value, Amortized Cost | 8,640.8 | 6,829.9
Gross Unrealized Gains | 9.9 | 39.4
Gross Unrealized Losses | 31.2 | 0.2
Fair Value | 7,350.6 |
Total assets measured at fair value, Fair Value | 8,619.5 | 6,869.1
Short-term Investments | 2,913.1 | 3,488.8
Long-term Investments | 4,415.5 | 1,757.7
Cash |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cash and Cash Equivalents | 572.3 | 644.3
Fair Value | 572.3 | 644.3
Level 1: |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cash and Cash Equivalents | 713.6 | 838.3
Total | 4,125.7 | 3,252.6
Gross Unrealized Gains | 6.3 | 23.0
Gross Unrealized Losses | 15.4 | 0.0
Fair Value | 4,116.6 | 3,275.6
Short-term Investments | 1,100.3 | 1,567.9
Long-term Investments | 2,302.7 | 869.4
Level 1: | Money market funds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cash and Cash Equivalents | 696.6 | 625.8
Fair Value | 696.6 | 625.8
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 | 17.0 | 212.5
Total | 3,429.1 | 2,626.8
Gross Unrealized Gains | 6.3 | 23.0
Gross Unrealized Losses | 15.4 | 0.0
Fair Value | 3,420.0 | 2,649.8
Short-term Investments | 1,100.3 | 1,567.9
Long-term Investments | 2,302.7 | 869.4
Level 2: |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cash and Cash Equivalents | 5.0 | 140.0
Total | 3,942.8 | 2,933.0
Gross Unrealized Gains | 3.6 | 16.4
Gross Unrealized Losses | 15.8 | 0.2
Fair Value | 3,930.6 | 2,949.2
Short-term Investments | 1,812.8 | 1,920.9
Long-term Investments | 2,112.8 | 888.3
Level 2: | Commercial paper |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cash and Cash Equivalents | 0.0 | 64.1
Total | 717.7 | 671.3
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
Fair Value | 717.7 | 671.3
Short-term Investments | 717.7 | 607.2
Long-term Investments | 0.0 | 0.0
Level 2: | Corporate securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cash and Cash Equivalents | 5.0 | 3.4
Total | 2,485.6 | 1,425.4
Gross Unrealized Gains | 2.7 | 11.9
Gross Unrealized Losses | 11.9 | 0.2
Fair Value | 2,476.4 | 1,437.1
Short-term Investments | 886.7 | 1,036.5
Long-term Investments | 1,584.7 | 397.2
Level 2: | U.S. government agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cash and Cash Equivalents | 0.0 | 72.5
Total | 526.1 | 716.5
Gross Unrealized Gains | 0.2 | 2.5
Gross Unrealized Losses | 2.9 | 0.0
Fair Value | 523.4 | 719.0
Short-term Investments | 137.8 | 233.6
Long-term Investments | 385.6 | 412.9
Level 2: | Municipal securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cash and Cash Equivalents | 0.0 | 0.0
Total | 213.4 | 119.8
Gross Unrealized Gains | 0.7 | 2.0
Gross Unrealized Losses | 1.0 | 0.0
Fair Value | 213.1 | 121.8
Short-term Investments | 70.6 | 43.6
Long-term Investments | $ 142.5 | $ 78.2

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