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Income Taxes - Valuation Allowance (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Valuation Allowance [Line Items] |  |
Total valuation allowance | $ 159.0 | $ 214.2
Geographic Distribution, Foreign [Member] |  |
Valuation Allowance [Line Items] |  |
Total valuation allowance | 133.8 | 188.1
Geographic Distribution, Domestic [Member] |  |
Valuation Allowance [Line Items] |  |
Total valuation allowance | $ 25.2 | $ 26.1

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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://fasb.org/us-gaap/role/ref/legacyRef -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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Period Type: | instant

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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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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |