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Derivatives and Fair Value Measurements Financial Instruments Measured on a Recurring Basis (Details) - Successor - Fair Value, Measurements, Recurring [Member] $ in Millions	Dec. 31, 2017 USD ($)
Derivative [Line Items]
Assets And Liabilities Fair Value Disclosure	$ 4.2
Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	4.2
Fair Value, Inputs, Level 1 [Member]
Derivative [Line Items]
Assets And Liabilities Fair Value Disclosure	0.0
Fair Value, Inputs, Level 1 [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	0.0
Fair Value, Inputs, Level 2 [Member]
Derivative [Line Items]
Assets And Liabilities Fair Value Disclosure	4.2
Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	4.2
Fair Value, Inputs, Level 3 [Member]
Derivative [Line Items]
Assets And Liabilities Fair Value Disclosure	0.0
Fair Value, Inputs, Level 3 [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	$ 0.0

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- Definition

Assets and liabilities fair value disclosure.

+ References

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- Definition

Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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