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Income Taxes, 2017 Tax Cuts and Jobs Act (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 22, 2017 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Taxes |  |  |  |  |
U.S. statutory federal tax rate (as a percent) | 35.00% |  | 21.00% | 21.00% | 35.00%
Provisional Tax Act Charge |  |  |  |  | $ 398.5
Estimated Transition Tax |  |  |  |  | 259.4
Provisional charge on unremitted foreign earnings |  |  |  |  | 176.6
Income tax expense (benefit) associated with the remeasurement of net deferred tax liabilities |  |  |  |  | $ (37.5)
Income tax expense (benefit) |  | $ (14.5) |  | $ (14.5) |
Period for payment of Transition Tax |  |  | 8 years |  |

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- Definition Amount of reasonable estimate for income tax impact on unremitted foreign earnings pursuant to Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete. + References No definition available. + Details
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- Definition Amount of income tax expense (benefit) from effect of Tax Cuts and Jobs Act. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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- Definition Amount of reasonable estimate for income tax expense for which accounting for tax effect from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated is incomplete pursuant to Tax Cuts and Jobs Act. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 2A -Subparagraph (SAB Topic 5.EE.Q2(b)) -URI http://asc.fasb.org/extlink&oid=116825942&loc=SL116722634-122817 + Details
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