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Income Taxes Income Taxes - Rollforward of Deferred Tax Assets Valuation Allowance (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Valuation Allowance [Line Items] |  |  |
Deferred Tax Assets, Valuation Allowance, Beginning Balance | $ 113.3 | $ 135.7 | $ 147.1
Deferred Tax Asset Valuation Allowance, Change in Assessment |  | (0.3) | (7.4)
Deferred Tax Asset Valuation Allowance, Current Year Operations | 56.7 | (22.1) | (4.0)
Deferred Tax Assets, Valuation Allowance, Ending Balance | 170.0 | 113.3 | 135.7
Domestic Tax Authority [Member] |  |  |
Valuation Allowance [Line Items] |  |  |
Deferred Tax Assets, Valuation Allowance, Beginning Balance | 0.0 | 0.0 | 0.0
Deferred Tax Asset Valuation Allowance, Change in Assessment |  | 0.0 | 0.0
Deferred Tax Asset Valuation Allowance, Current Year Operations | 0.0 | 0.0 | 0.0
Deferred Tax Assets, Valuation Allowance, Ending Balance | 0.0 | 0.0 | 0.0
State and Local Jurisdiction [Member] |  |  |
Valuation Allowance [Line Items] |  |  |
Deferred Tax Assets, Valuation Allowance, Beginning Balance | 45.9 | 41.5 | 45.0
Deferred Tax Asset Valuation Allowance, Change in Assessment |  | 0.0 | 0.0
Deferred Tax Asset Valuation Allowance, Current Year Operations | 26.5 | 4.4 | (3.5)
Deferred Tax Assets, Valuation Allowance, Ending Balance | 72.4 | 45.9 | 41.5
Foreign Tax Authority [Member] |  |  |
Valuation Allowance [Line Items] |  |  |
Deferred Tax Assets, Valuation Allowance, Beginning Balance | 67.4 | 94.2 | 102.1
Deferred Tax Asset Valuation Allowance, Change in Assessment |  | (0.3) | (7.4)
Deferred Tax Asset Valuation Allowance, Current Year Operations | 30.2 | (26.5) | (0.5)
Deferred Tax Assets, Valuation Allowance, Ending Balance | $ 97.6 | $ 67.4 | $ 94.2

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- Definition Deferred Tax Asset Valuation Allowance, Current Year Operations + 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/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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