Business and Geographic Segments - Net Sales by Point of Origin and Point of Destination (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Net sales	$ 2,296.4	$ 1,849.7	$ 1,897.5
Point of Origin
Segment Reporting Information [Line Items]
Net sales	2,296.4	1,849.7	1,897.5
Point of Destination
Segment Reporting Information [Line Items]
Net sales	2,296.4	1,849.7	1,897.5
U.S. | Point of Origin
Segment Reporting Information [Line Items]
Net sales	1,409.1	1,189.8	1,164.8
Germany | Point of Origin
Segment Reporting Information [Line Items]
Net sales	971.7	836.0	883.6
Canada | Point of Origin
Segment Reporting Information [Line Items]
Net sales	371.9	319.5	328.7
Belgium | Point of Origin
Segment Reporting Information [Line Items]
Net sales	295.7	249.5	270.7
Norway | Point of Origin
Segment Reporting Information [Line Items]
Net sales	257.2	211.8	192.2
North America | Point of Destination
Segment Reporting Information [Line Items]
Net sales	999.7	778.2	740.1
Europe | Point of Destination
Segment Reporting Information [Line Items]
Net sales	945.7	783.8	824.2
Asia and other | Point of Destination
Segment Reporting Information [Line Items]
Net sales	351.0	287.7	333.2
Eliminations | Point of Origin
Segment Reporting Information [Line Items]
Net sales	$ (1,009.2)	$ (956.9)	$ (942.5)