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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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	$ 499.8	$ 416.9	$ 1,443.4	$ 1,223.9
Point of origin | Reportable Geographical Components | United States
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	297.6	272.9	787.5	736.5
Point of origin | Reportable Geographical Components | Germany
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	254.2	208.1	724.2	620.3
Point of origin | Reportable Geographical Components | Canada
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	88.6	93.8	288.8	247.1
Point of origin | Reportable Geographical Components | Belgium
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	69.6	64.9	212.0	181.9
Point of origin | Reportable Geographical Components | Norway
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	63.4	46.6	198.5	163.5
Point of origin | Eliminations
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	(273.6)	(269.4)	(767.6)	(725.4)
Point of destination | Europe
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	248.0	194.3	712.1	578.6
Point of destination | North America
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	174.3	153.2	476.9	434.4
Point of destination | Other
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	$ 77.5	$ 69.4	$ 254.4	$ 210.9

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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