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Income Taxes Net Unrecognized Tax Benefits (Details) - Successor - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Unrecognized Tax Benefits Recorded in Balance Sheet [Line Items] |  |
Deferred income taxes | $ 13.0 | $ 10.9
Other noncurrent liabilities | 1.0 | 1.8
Net unrecognized tax benefits | 14.0 | 12.7
Gross unrecognized tax benefits | $ 14.0 | $ 12.7

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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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