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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, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Valuation Allowance [Line Items] |  |  |
Deferred Tax Assets, Valuation Allowance, Beginning Balance | $ 147.1 | $ 135.3 | $ 536.7
Deferred Tax Asset Valuation Allowance, Change in Assessment | (7.4) | 2.5 | (370.9)
Deferred Tax Asset Valuation Allowance, Current Year Operations | (4.0) | 9.3 | (30.5)
Deferred Tax Assets, Valuation Allowance, Ending Balance | 135.7 | 147.1 | 135.3
Domestic Tax Authority [Member] |  |  |
Valuation Allowance [Line Items] |  |  |
Deferred Tax Assets, Valuation Allowance, Beginning Balance | 0.0 | 0.0 | 352.8
Deferred Tax Asset Valuation Allowance, Change in Assessment | 0.0 | 0.0 | (339.6)
Deferred Tax Asset Valuation Allowance, Current Year Operations | 0.0 | 0.0 | (13.2)
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 | 45.0 | 44.7 | 122.4
Deferred Tax Asset Valuation Allowance, Change in Assessment | 0.0 | 0.0 | (35.0)
Deferred Tax Asset Valuation Allowance, Current Year Operations | (3.5) | 0.3 | (42.7)
Deferred Tax Assets, Valuation Allowance, Ending Balance | 41.5 | 45.0 | 44.7
Foreign Tax Authority [Member] |  |  |
Valuation Allowance [Line Items] |  |  |
Deferred Tax Assets, Valuation Allowance, Beginning Balance | 102.1 | 90.6 | 61.5
Deferred Tax Asset Valuation Allowance, Change in Assessment | (7.4) | 2.5 | 3.7
Deferred Tax Asset Valuation Allowance, Current Year Operations | (0.5) | 9.0 | 25.4
Deferred Tax Assets, Valuation Allowance, Ending Balance | $ 94.2 | $ 102.1 | $ 90.6

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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=6907707&loc=d3e32537-109319 + Details
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