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Income Taxes - Deferred Income Tax Assets and Liabilities and Valuation Allowances Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Tax Credit Carryforward [Line Items] |  |  |
Deferred Tax Assets, Operating Loss and Tax Credit Carryforwards | $ 320.2 | $ 258.8 |
Deferred Tax Assets, Operating Loss and Tax Credit Carryforwards, Not Subject to Expiration | 107.7 |  |
Valuation allowance, deferred tax asset, increase (decrease), amount | 14.5 | 25.4 | $ 16.0
Deferred Tax Assets, Valuation Allowance | 208.0 | 196.0 |
United States |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Valuation allowance, deferred tax asset, increase (decrease), amount | $ 5.3 |  |
Foreign Tax Authority [Member] |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Valuation allowance, deferred tax asset, increase (decrease), amount |  | $ 12.8 | $ 3.1

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- Definition The sum of the tax effects as of the balance sheet date of the amount of excesses of tax deductions over gross income in a year which cannot be used on the tax returns in the current year but can be carried forward to reduce taxable income or income taxes payable in a future year, for which there must be sufficient tax-basis income to utilize a portion or all of the carryforward amount to realize the deferred tax asset. Amount also includes the tax effect as of the balance sheet date of the amount of future tax deductions arising from all unused tax credit carryforwards which have been reduced by a valuation allowance. + References No definition available. + Details
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- Definition The amount of operating loss carryforwards and unused tax credit carryforwards available to reduce future taxable income which are not subject to expiration dates. + References No definition available. + Details
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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/disclosureRef -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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Details
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