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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 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Income from discontinued operations, net of tax $ 1.4 $ 7.3 $ 0.8 $ 2.2  
Total current assets 32.6   32.6   $ 63.3
Total current liabilities 9.5   9.5   17.5
Waterloo [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Net sales 27.5   50.4    
Income from discontinued operations before income taxes 2.4   1.6    
Income taxes 1.0   0.8    
Income from discontinued operations, net of tax 1.4   0.8    
Accounts receivable, net 21.4   21.4   40.1
Inventories 8.3   8.3   15.9
Other current assets 2.9   2.9   7.3
Total current assets 32.6   32.6   63.3
Property, plant and equipment, net 14.2   14.2   13.3
Other non-current assets 4.8   4.8   4.0
Total assets 51.6   51.6   80.6
Accounts payable 5.2   5.2   8.5
Other current liabilities 4.3   4.3   9.0
Total current liabilities 9.5   9.5   17.5
Other non-current liabilities 2.6   2.6   3.4
Total liabilities $ 12.1   $ 12.1   $ 20.9
Waterloo and Simonton [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Net sales   115.0   192.1  
Income from discontinued operations before income taxes   11.3   4.1  
Income taxes   4.0   1.9  
Income from discontinued operations, net of tax   $ 7.3   $ 2.2