Income Taxes - Additional Information (Detail)
CAD in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2015
CAD
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Income Tax [Line Items]                  
U.S. Federal statutory income tax rate           35.00%      
Valuation allowance           $ 159.0      
Non-cash deferred income tax asset valuation allowance           9.8      
Aggregate letter of credit outstanding amount | CAD             CAD 7.9    
Non-cash income tax benefit recognized related to release of portion of reserve for uncertain tax positions         $ 5.7        
Amount of interest and penalties   $ 2.3       2.3   $ 2.8 $ 3.7
Benefits if uncertain tax position recognized   7.8       7.8   $ 8.8 $ 15.1
Canadian Income Tax Audit                  
Income Tax [Line Items]                  
Non-cash income tax benefit recognized related to release of portion of reserve for uncertain tax positions         3.0        
U.S. Income Tax Audit                  
Income Tax [Line Items]                  
Non-cash income tax benefit recognized related to release of portion of reserve for uncertain tax positions         $ 3.1        
Germany and Belgian                  
Income Tax [Line Items]                  
Valuation allowance $ 150.3 6.4 $ 2.3 $ 150.3          
Non-cash deferred income tax asset valuation allowance   8.7 $ 8.7            
Corporate Purposes | Germany                  
Income Tax [Line Items]                  
Net operating loss carryforwards   683.0       683.0      
Corporate Purposes | Belgium                  
Income Tax [Line Items]                  
Net operating loss carryforwards   86.0       86.0      
Trade Tax Purposes | Germany                  
Income Tax [Line Items]                  
Net operating loss carryforwards   $ 96.0       $ 96.0