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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Valuation Allowance [Line Items] |  |  |
Deferred Tax Assets, Valuation Allowance, Beginning Balance | $ 129.8 | $ 141.0 | $ 170.0
Change in assessment | (6.2) | 5.6 | (22.9)
Current year operations | (0.6) | (16.8) | (6.1)
Deferred Tax Assets, Valuation Allowance, Ending Balance | 123.0 | 129.8 | 141.0
State and Local Jurisdiction [Member] |  |  |
Valuation Allowance [Line Items] |  |  |
Deferred Tax Assets, Valuation Allowance, Beginning Balance | 48.5 | 57.3 | 72.4
Change in assessment | 0.0 | 0.0 | 0.0
Current year operations | (8.1) | (8.8) | (15.1)
Deferred Tax Assets, Valuation Allowance, Ending Balance | 40.4 | 48.5 | 57.3
Foreign Tax Authority [Member] |  |  |
Valuation Allowance [Line Items] |  |  |
Deferred Tax Assets, Valuation Allowance, Beginning Balance | 81.3 | 83.7 | 97.6
Change in assessment | (6.2) | 5.6 | (22.9)
Current year operations | 7.5 | (8.0) | 9.0
Deferred Tax Assets, Valuation Allowance, Ending Balance | $ 82.6 | $ 81.3 | $ 83.7

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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://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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