Discontinued Operations - Summary of Operating Results and Summary of Major Classes of Assets and Liabilities Reflected as Discontinued Operations on Consolidated Comprehensive Income and Balance Sheet (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from discontinued operations, net of tax	$ 0.4	$ 7.8	$ 1.4	$ (0.6)	$ (11.1)	$ (105.4)	$ 7.3	$ (5.1)	$ 9.0	$ (114.3)	$ 21.9
Total current assets					63.3					63.3
Total current liabilities					17.5					17.5
Waterloo [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales									78.2
(Loss) income from discontinued operations before income taxes									(16.0)
Income tax (benefit) expense									(25.0)
Income (loss) from discontinued operations, net of tax									$ 9.0
Accounts receivable, net					40.1					40.1
Inventories					15.9					15.9
Other current assets					7.3					7.3
Total current assets					63.3					63.3
Property, plant and equipment, net					13.3					13.3
Other non-current assets					4.0					4.0
Total assets					80.6					80.6
Accounts payable					8.5					8.5
Other current liabilities					9.0					9.0
Total current liabilities					17.5					17.5
Other non-current liabilities					3.4					3.4
Total liabilities					$ 20.9					20.9
Waterloo and Simonton [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales										369.4	453.8
(Loss) income from discontinued operations before income taxes										(90.8)	34.4
Income tax (benefit) expense										23.5	12.5
Income (loss) from discontinued operations, net of tax										$ (114.3)	$ 21.9