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Income Taxes - Schedule Of Income Tax Difference From Statutory Rate (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 31, 2019 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Federal tax at statutory rate |  |  |  |  |  |  |  |  |  | $ 315.5 | $ 268.7 | $ 386.7
State taxes, net of federal benefits |  |  |  |  |  |  |  |  |  | 29.7 | 20.8 | 16.0
Foreign rate differential |  |  |  |  |  |  |  |  |  | (56.2) | (44.7) | (115.7)
U.S. tax on foreign earnings |  |  |  |  |  |  |  |  |  | 55.0 | 43.7 | 8.4
Research and development credit |  |  |  |  |  |  |  |  |  | (32.7) | (25.2) | (15.3)
Share-based compensation not benefited |  |  |  |  |  |  |  |  |  | 13.5 | 9.9 | 10.8
Domestic production activities deduction |  |  |  |  |  |  |  |  |  | 0.0 | 0.0 | (7.9)
Reversal of unrecognized tax benefits |  |  |  |  |  |  |  |  |  | (8.4) | (5.2) | (62.4)
Tax Cuts and Jobs Act impact |  |  |  |  |  |  |  |  |  | 0.0 | 0.5 | 317.8
Excess tax benefits related to share-based compensation arrangements |  | $ (33.7) | $ (28.8) | $ (11.3) | $ (72.7) | $ (15.8) | $ (24.1) | $ (21.6) | $ (54.7) | (146.5) | (116.2) | (102.8)
Deferred tax remeasurement due to Swiss Tax Reform | $ (51.3) |  |  |  |  |  |  |  |  | (51.3) | 0.0 | 0.0
Other |  |  |  |  |  |  |  |  |  | 1.8 | 2.2 | (1.7)
Total income tax expense |  |  |  |  |  |  |  |  |  | $ 120.4 | $ 154.5 | $ 433.9

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- Definition Income Tax Reconciliation Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations + References No definition available. + Details
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- Definition Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=117330312&loc=d3e23163-113944 + Details
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