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Income Taxes - Additional Information (Detail)
CAD in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
CAD
Dec. 31, 2015
USD ($)
Income Tax [Line Items]              
U.S. Federal statutory income tax rate       35.00%      
Income taxes $ 5.4     $ 5.4     $ 5.7
Decrease in unrecognized tax benefits excluding accrued interest during next twelve months 4.1     4.1      
Valuation allowance (0.8) $ 2.3   2.1 $ 152.6    
Germany and Belgium              
Income Tax [Line Items]              
Valuation allowance   $ 2.3 $ 150.3 $ 2.1      
US-Canada APA              
Income Tax [Line Items]              
U.S.-Canada Advance Pricing Agreement, description       Tax authorities are examining certain of our U.S. and non-U.S. tax returns and have or may propose tax deficiencies, including penalties and interest. Because of the inherent uncertainties involved in settlement initiatives and court and tax proceedings, we cannot guarantee that these matters will be resolved in our favor, and therefore our potential exposure, if any, is also uncertain. As a result of ongoing audits in certain jurisdictions, in 2008 we filed Advance Pricing Agreement Requests with the tax authorities in the U.S., Canada and Germany. These requests have been under review with the respective tax authorities since 2008 and prior to the third quarter of 2016, it was uncertain whether an agreement would be reached between the tax authorities and whether we would agree to execute and finalize such agreements. During the third quarter of 2016, Contran, as the ultimate parent of our U.S. Consolidated income tax group, executed and finalized an Advance Pricing Agreement with the U.S. Internal Revenue Service and our Canadian subsidiary executed and finalized an Advance Pricing Agreement with the Competent Authority for Canada (collectively, the “U.S.-Canada APA”) effective for tax years 2005 - 2015.      
U.S.-Canada APA (5.6)     $ (5.6)      
US-Canada APA | Canadian Subsidiary              
Income Tax [Line Items]              
Income tax payable 2.3     2.3   CAD 3  
Income taxes $ 2.3     $ 2.3      
US-Canada APA | Canada Revenue Agency | Canadian Subsidiary | Earliest Tax Year              
Income Tax [Line Items]              
Effective tax year 2005            
US-Canada APA | Canada Revenue Agency | Canadian Subsidiary | Latest Tax Year              
Income Tax [Line Items]              
Effective tax year 2015