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Income Taxes - Valuation Allowance (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Valuation allowance |  |
Valuation allowance | $ 245.2 | $ 158.8
Federal |  |
Valuation allowance |  |
Valuation allowance | 161.6 | 69.4
State |  |
Valuation allowance |  |
Valuation allowance | 49.5 | 48.9
Foreign |  |
Valuation allowance |  |
Valuation allowance | $ 34.0 | $ 40.5

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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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- 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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