Revenue Recognition - Disaggregation of Net Sales by Place of Manufacture and to Location of Customer (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	$ 421.0	$ 436.5
Point of origin | Reportable Geographical Components | United States
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	237.0	245.3
Point of origin | Reportable Geographical Components | Germany
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	229.1	219.2
Point of origin | Reportable Geographical Components | Canada
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	67.7	78.5
Point of origin | Reportable Geographical Components | Belgium
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	66.1	69.7
Point of origin | Reportable Geographical Components | Norway
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	54.3	51.5
Point of origin | Eliminations
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	(233.2)	(227.7)
Point of destination | Europe
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	214.5	215.2
Point of destination | North America
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	132.3	146.8
Point of destination | Other
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	$ 74.2	$ 74.5