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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
	Mar. 31, 2018	Mar. 31, 2017
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	$ 430.4	$ 369.8
ASC 606
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	430.4	369.8
ASC 606 | Point of origin | Reportable Geographical Components | Germany
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	234.5	183.6
ASC 606 | Point of origin | Reportable Geographical Components | United States
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	196.8	205.7
ASC 606 | Point of origin | Reportable Geographical Components | Canada
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	71.6	77.9
ASC 606 | Point of origin | Reportable Geographical Components | Belgium
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	69.7	58.1
ASC 606 | Point of origin | Reportable Geographical Components | Norway
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	53.1	47.3
ASC 606 | Point of origin | Eliminations
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	(195.3)	(202.8)
ASC 606 | Point of destination | Europe
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	233.9	179.7
ASC 606 | Point of destination | North America
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	127.0	124.0
ASC 606 | Point of destination | Other
Entity Wide Information Revenue From External Customer [Line Items]
Net sales	$ 69.5	$ 66.1

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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