Debtor-In-Possession Financial Information - Statement of Operations (Detail) - USD ($) $ in Millions	3 Months Ended								9 Months Ended	12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues	$ 326.3	$ 332.8	$ 350.2	$ 337.1	$ 304.5	$ 314.9	$ 320.9	$ 309.4		$ 1,346.4	$ 1,249.7	$ 1,145.6
Cost of sales	311.0	320.5	332.1	323.7	293.3	298.3	298.6	292.8		1,287.3	1,183.0	1,070.7
Gross profit	15.3	12.3	18.1	13.4	11.2	16.6	22.3	16.6		59.1	66.7	74.9
Selling, general and administrative expenses										52.3	61.0	56.0
Amortization of identifiable intangible assets										2.4	2.4	2.0
Identifiable intangible asset impairment	10.1									10.1	0.1	0.0
Property, plant and equipment impairment	40.5									40.5
Operating profit (loss)	(49.9)	$ (34.8)	$ 3.8	$ (3.6)	$ (67.2)	$ (3.5)	$ 8.1	$ (2.1)		(84.5)	(64.7)	10.2
Nonoperating expense (income):
Interest expense, net										41.7	37.3	34.9
Foreign exchange losses (gains) on intercompany loans										(2.4)	2.4	1.3
Reorganization items, net	$ 11.7									11.7
Other, net										0.4	(0.3)	(1.5)
Total nonoperating expense, net										44.1	39.1	51.0
Loss from continuing operations before income taxes										(128.6)	(103.8)	(40.8)
Income tax benefit										(7.8)	(0.6)	(9.1)
Net loss									$ (58.0)	(120.8)	$ (102.6)	$ (6.8)
Debtors
Revenues										71.3
Cost of sales										66.9
Gross profit										4.4
Selling, general and administrative expenses										2.6
Amortization of identifiable intangible assets										0.3
Identifiable intangible asset impairment										10.1
Property, plant and equipment impairment										40.5
Operating profit (loss)										(49.1)
Nonoperating expense (income):
Interest expense, net										5.6
Foreign exchange losses (gains) on intercompany loans										(2.4)
Reorganization items, net										11.7
Other, net										2.0
Total nonoperating expense, net										16.9
Loss from continuing operations before income taxes										(66.0)
Income tax benefit										(11.9)
Net loss										$ (54.1)