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Revenue Recognition - Disaggregation of Net Sales by Place of Manufacture and to Location of Customer (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	$ 416.9	$ 437.4	$ 1,223.9	$ 1,358.4
Point of origin | Reportable Geographical Components | United States
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	272.9	227.7	736.5	762.3
Point of origin | Reportable Geographical Components | Germany
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	208.1	238.3	620.3	706.0
Point of origin | Reportable Geographical Components | Canada
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	93.8	84.0	247.1	258.4
Point of origin | Reportable Geographical Components | Belgium
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	64.9	58.3	181.9	205.7
Point of origin | Reportable Geographical Components | Norway
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	46.6	46.0	163.5	145.2
Point of origin | Eliminations
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	(269.4)	(216.9)	(725.4)	(719.2)
Point of destination | Europe
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	194.3	201.6	578.6	646.2
Point of destination | North America
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	153.2	147.8	434.4	456.1
Point of destination | Other
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	$ 69.4	$ 88.0	$ 210.9	$ 256.1

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