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Income Taxes - Valuation Allowance (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Valuation allowance |  |
Valuation allowance | $ 158.8 | $ 119.0
FTC |  |
Valuation allowance |  |
Valuation allowance | 0.0 | 12.7
Federal |  |
Valuation allowance |  |
Valuation allowance | 69.4 | 27.3
State |  |
Valuation allowance |  |
Valuation allowance | 48.9 | 41.3
Foreign |  |
Valuation allowance |  |
Valuation allowance | $ 40.5 | $ 37.7

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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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