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Income Taxes, 2017 Tax Cuts and Jobs Act (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Taxes |  |  |  |
U.S. statutory federal tax rate (as a percent) | 21.00% | 21.00% | 21.00% |
Income tax expense (benefit) |  |  | $ (14.5) |
Period for payment of Transition Tax | 8 years |  |  |
Transition Tax |  |  |  | $ 259.4

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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 No definition available. + Details
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- Definition Period of time over which TCJA transition tax on certain unrepatriated earnings of foreign subsidiaries may be paid. + 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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