Debtor-In-Possession Financial Information - Statement of Cash Flows (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net loss		$ (58.0)	$ (120.8)	$ (102.6)	$ (6.8)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization			45.1	48.6	32.5
Deferred income taxes			(8.9)	(3.9)	(2.1)
Share-based compensation expense			2.1	3.6	1.3
Amortization of debt issuance costs			7.6	5.1	4.3
Unrealized foreign exchange gains on intercompany loans			(2.5)	2.1
Identifiable intangible asset impairment	$ 10.1		10.1	0.1	0.0
Property, plant and equipment impairment	40.5		40.5
Noncash reorganization items, net			6.0
Other, net			2.5	2.5	1.5
Changes in operating assets and liabilities:
Trade accounts receivable, net			(28.2)	(14.1)	3.7
Inventories			15.9	(9.6)	44.6
Prepaid expenses, supplies and other current assets			(9.3)	(2.4)	0.9
Other noncurrent assets			0.1	(0.5)	(2.0)
Trade payables			(6.6)	18.3	(8.2)
Accrued liabilities			(18.0)	(4.8)	19.1
Other noncurrent liabilities			13.2	2.4	(1.7)
Net cash provided by (used in) operating activities		(20.6)	(12.9)	9.3	93.2
Cash flows from investing activities:
Purchases of property and equipment			(23.8)	(30.8)	(26.0)
Other, net			(0.6)	(0.1)	(0.7)
Net cash used in investing activities			(24.4)	(54.5)	(473.3)
Cash flows from financing activities:
Repayments on capital leases and the Revolving Credit Facilities			(219.8)	(97.8)	(108.3)
Proceeds from issuance of RA DIP Financing, net of debt issuance costs			103.2
Other, net			(3.4)	2.7
Net cash provided by financing activities			36.7	35.0	$ 358.0
Debtors
Cash flows from operating activities:
Net loss			(54.1)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization			3.3
Deferred income taxes			(9.1)
Share-based compensation expense			0.2
Amortization of debt issuance costs			1.3
Unrealized foreign exchange gains on intercompany loans			(2.4)
Identifiable intangible asset impairment			10.1
Property, plant and equipment impairment			40.5
Noncash reorganization items, net			6.0
Other, net			(0.1)
Changes in operating assets and liabilities:
Trade accounts receivable, net			(14.2)
Inventories			3.8
Prepaid expenses, supplies and other current assets			(5.8)
Other noncurrent assets			1.2
Trade payables			11.8
Accrued liabilities			(9.7)
Other noncurrent liabilities			13.8
Net cash provided by (used in) operating activities			(3.4)
Cash flows from investing activities:
Change in intercompany receivables			(0.5)
Distributions from subsidiaries			0.2
Purchases of property and equipment			(0.3)
Other, net			(0.1)
Net cash used in investing activities			(0.7)
Cash flows from financing activities:
Repayments on capital leases and the Revolving Credit Facilities			(94.5)
Proceeds from issuance of RA DIP Financing, net of debt issuance costs			103.2
Repayments on RA DIP ABL Facility			(0.1)
Other, net			2.4
Net cash provided by financing activities			11.0
Increase in cash, cash equivalents, restricted cash and restricted cash equivalents			6.9
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Beginning Balance		$ 8.1	8.1
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Ending Balance	$ 15.0		$ 15.0	$ 8.1