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Income Taxes The 2017 U.S. Tax Cuts and Jobs Act (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Sep. 30, 2017 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |
Foreign tax credits | $ 31.2 |
Provisional deferred income tax benefit due to the Tax Act |  | $ 104.7
Provisional tax effect of this deemed repatriation of unremitted foreign earnings |  | $ 62.3

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- Definition Provisional net benefit to our deferred income taxes due to the Tax Act Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Deferred Tax Liability, Provisional Income Tax (Expense) Benefit + References No definition available. + Details
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- Definition Provisional tax effect of this deemed repatriation of unremitted foreign earnings + References No definition available. + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign tax credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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