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Income Taxes Net Unrecognized Tax Benefits (Details) - Successor - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
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

Net Unrecognized Tax Benefit

+ References

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- Definition

Unrecognized Tax Benefit Recorded in Deferred Income Taxes

+ References

No definition available.

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- Definition

Unrecognized Tax Benefit Recorded in Other Noncurrent Liabilities

+ References

No definition available.

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- Definition

[Line Items] for Unrecognized Tax Benefits Recorded in Balance Sheet

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No definition available.

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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

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