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Geographic Information - Net Sales and Property and Equipment by Geographical Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Revenues From External Customers And Long Lived Assets [Line Items]                      
Net sales $ 333.7 $ 356.1 $ 356.1 $ 318.4 $ 287.0 $ 336.5 $ 360.2 $ 365.1 $ 1,364.3 $ 1,348.8 $ 1,651.9
Net property and equipment 434.0       429.5       434.0 429.5  
Germany                      
Revenues From External Customers And Long Lived Assets [Line Items]                      
Net property and equipment 208.2       212.1       208.2 212.1  
Canada                      
Revenues From External Customers And Long Lived Assets [Line Items]                      
Net property and equipment 59.3       53.8       59.3 53.8  
Belgium                      
Revenues From External Customers And Long Lived Assets [Line Items]                      
Net property and equipment 78.6       80.1       78.6 80.1  
Norway                      
Revenues From External Customers And Long Lived Assets [Line Items]                      
Net property and equipment 73.3       69.5       73.3 69.5  
Other                      
Revenues From External Customers And Long Lived Assets [Line Items]                      
Net property and equipment $ 14.6       $ 14.0       14.6 14.0  
Point of origin | Reportable Geographical Components | Germany                      
Revenues From External Customers And Long Lived Assets [Line Items]                      
Net sales                 699.8 690.0 844.1
Point of origin | Reportable Geographical Components | United States                      
Revenues From External Customers And Long Lived Assets [Line Items]                      
Net sales                 664.2 657.8 783.1
Point of origin | Reportable Geographical Components | Canada                      
Revenues From External Customers And Long Lived Assets [Line Items]                      
Net sales                 257.7 216.9 252.3
Point of origin | Reportable Geographical Components | Belgium                      
Revenues From External Customers And Long Lived Assets [Line Items]                      
Net sales                 187.4 198.8 249.3
Point of origin | Reportable Geographical Components | Norway                      
Revenues From External Customers And Long Lived Assets [Line Items]                      
Net sales                 164.8 183.5 256.8
Point of origin | Eliminations                      
Revenues From External Customers And Long Lived Assets [Line Items]                      
Net sales                 (609.6) (598.2) (733.7)
Point of destination | Europe                      
Revenues From External Customers And Long Lived Assets [Line Items]                      
Net sales                 697.6 700.4 882.9
Point of destination | North America                      
Revenues From External Customers And Long Lived Assets [Line Items]                      
Net sales                 413.2 421.4 544.3
Point of destination | Other                      
Revenues From External Customers And Long Lived Assets [Line Items]                      
Net sales                 $ 253.5 $ 227.0 $ 224.7