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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended | 24 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018
Operating Loss Carryforwards [Line Items] |  |  |
Valuation allowance | $ 26.4 | $ 25.7 | $ 26.4
Unrecognized tax benefits that would impact effective tax rate | 62.0 |  | 62.0
Unrecognized tax benefits, income tax penalties and interest expense | 1.7 |  |
Accrued interest and penalties | 6.9 | 5.1 | 6.9
Expected decrease of unrecognized tax benefits | 2.3 |  | 2.3
Tax Act, total impact, income tax benefit |  |  | 229.5
Tax Act, provisional income tax benefit |  | 215.4 |
Tax Act, measurement period adjustment, income tax benefit | 14.1 |  |
Tax Act, change in tax rate, income tax benefit |  | 379.0 |
Tax Act, mandatory repatriation on undistributed foreign earnings, total income tax expense |  |  | 102.4
Tax Act, mandatory repatriation on undistributed foreign earnings, provisional income tax expense |  | 110.7 |
Tax Act, mandatory repatriation on undistributed foreign earnings, measurement period adjustment, income tax benefit | 8.3 |  |
Tax Act, repatriation of foreign earnings, change in assertion, total income tax expense |  |  | 22.8
Tax Act, repatriation of foreign earnings, change in assertion, provisional income tax expense |  | 28.7 |
Tax Act, repatriation of foreign earnings, change in assertion, measurement period adjustment, income tax benefit | 5.8 |  |
Tax Cuts and Jobs Act of 2017, write off of foreign tax credits |  | $ 24.2 |
Internal Revenue Service (IRS) |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | 19.7 |  | 19.7
Valuation allowance | 9.1 |  | 9.1
Internal Revenue Service (IRS) | Research Tax Credit Carryforward |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforward | 8.0 |  | 8.0
State and Local Jurisdiction |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | 32.2 |  | 32.2
Foreign Tax Authority |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | 22.8 |  | 22.8
Valuation allowance | $ 17.3 |  | $ 17.3

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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