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Predecessor Company Share-Based Compensation Expense and Cash Flows (Details) - Predecessor - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Apr. 01, 2017	Dec. 31, 2016
Share-Based Compensation Expense and Cash Flows (Line Items)
Total share-based compensation expense	$ 1.9	$ 12.8
Tax benefit	0.0	0.0
Share-based compensation expense, net of tax benefit	1.9	12.8
Cash received upon the exercise of stock options and from employee stock purchases	0.0	0.0
Write-off tax benefits related to share-based compensation	0.0	0.0
Equity classified awards
Share-Based Compensation Expense and Cash Flows (Line Items)
Share-based compensation expense	1.9	11.3
Liability classified awards
Share-Based Compensation Expense and Cash Flows (Line Items)
Share-based compensation expense	$ 0.0	$ 1.5

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- Definition

Share Based Compensation Expense Net of Tax.

+ References

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- Definition

The aggregate amount of noncash, equity- and liability- based employee renumeration.

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- Definition

Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 740
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=79981250&loc=d3e23524-113945

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
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-Paragraph 2A
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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 230
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-Section 45
-Paragraph 28
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