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Income Taxes Net Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Apr. 01, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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Successor |  |  |  |  |
Unrecognized Tax Benefits Recorded in Balance Sheet [Line Items] |  |  |  |  |
Unrecognized Tax Benefit Recorded in Deferred Income Taxes | $ 10.9 |  |  |  |
Unrecognized Tax Benefit Recorded in Other Noncurrent Liabilities | 1.8 |  |  |  |
Net Unrecognized Tax Benefit | 12.7 |  |  |  |
Unrecognized Tax Benefits | $ 12.7 | $ 12.5 |  |  |
Predecessor |  |  |  |  |
Unrecognized Tax Benefits Recorded in Balance Sheet [Line Items] |  |  |  |  |
Unrecognized Tax Benefit Recorded in Deferred Income Taxes |  |  | $ 8.9 |  |
Unrecognized Tax Benefit Recorded in Other Noncurrent Liabilities |  |  | 11.2 |  |
Net Unrecognized Tax Benefit |  |  | 20.1 |  |
Unrecognized Tax Benefits |  | $ 12.5 | $ 20.1 | $ 22.9 | $ 44.5

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- Definition Unrecognized Tax Benefit Recorded in Deferred Income Taxes + References No definition available. + Details
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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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