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Business and Geographic Segments - Net Property and Equipment by Segment (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Net property and equipment:      
Net property and equipment $ 563.0 $ 563.5 $ 588.7
United States      
Net property and equipment:      
Net property and equipment 72.0 74.5 80.8
Germany      
Net property and equipment:      
Net property and equipment 233.6 245.8 259.2
Canada      
Net property and equipment:      
Net property and equipment 73.1 66.1 69.0
Norway      
Net property and equipment:      
Net property and equipment 87.9 81.0 81.7
Belgium      
Net property and equipment:      
Net property and equipment $ 96.4 $ 96.1 $ 98.0