Disaggregation of Sales - Schedule of Disaggregates of Net Sales of our Chemicals Segment (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation Of Revenue [Line Items]
Net sales	$ 2,222.5	$ 2,296.4	$ 1,849.7
Point Of Origin
Disaggregation Of Revenue [Line Items]
Net sales	2,222.5	2,296.4	1,849.7
Point Of Origin | United States
Disaggregation Of Revenue [Line Items]
Net sales	1,518.9	1,409.1	1,189.8
Point Of Origin | Germany
Disaggregation Of Revenue [Line Items]
Net sales	895.4	971.7	836.0
Point Of Origin | Canada
Disaggregation Of Revenue [Line Items]
Net sales	389.4	371.9	319.5
Point Of Origin | Belgium
Disaggregation Of Revenue [Line Items]
Net sales	306.5	295.7	249.5
Point Of Origin | Norway
Disaggregation Of Revenue [Line Items]
Net sales	273.5	257.2	211.8
Point Of Origin | Eliminations
Disaggregation Of Revenue [Line Items]
Net sales	(1,161.2)	(1,009.2)	(956.9)
Point Of Destination
Disaggregation Of Revenue [Line Items]
Net sales	2,222.5	2,296.4	1,849.7
Point Of Destination | Europe
Disaggregation Of Revenue [Line Items]
Net sales	879.0	945.7	783.8
Point Of Destination | North America
Disaggregation Of Revenue [Line Items]
Net sales	985.4	999.7	778.2
Chemicals
Disaggregation Of Revenue [Line Items]
Net sales	1,930.2	1,939.4	1,638.8
Chemicals | Point Of Origin
Disaggregation Of Revenue [Line Items]
Net sales	1,930.2	1,939.4	1,638.8
Chemicals | Point Of Origin | United States
Disaggregation Of Revenue [Line Items]
Net sales	1,226.6	1,052.1	978.8
Chemicals | Point Of Origin | Germany
Disaggregation Of Revenue [Line Items]
Net sales	895.4	971.7	836.0
Chemicals | Point Of Origin | Canada
Disaggregation Of Revenue [Line Items]
Net sales	389.4	371.9	319.5
Chemicals | Point Of Origin | Belgium
Disaggregation Of Revenue [Line Items]
Net sales	306.5	295.7	249.5
Chemicals | Point Of Origin | Norway
Disaggregation Of Revenue [Line Items]
Net sales	273.5	257.2	211.8
Chemicals | Point Of Origin | Eliminations
Disaggregation Of Revenue [Line Items]
Net sales	(1,161.2)	(1,009.2)	(956.8)
Chemicals | Point Of Destination
Disaggregation Of Revenue [Line Items]
Net sales	1,930.2	1,939.4	1,638.8
Chemicals | Point Of Destination | Europe
Disaggregation Of Revenue [Line Items]
Net sales	878.3	945.0	783.2
Chemicals | Point Of Destination | North America
Disaggregation Of Revenue [Line Items]
Net sales	695.7	645.7	569.3
Chemicals | Point Of Destination | Other
Disaggregation Of Revenue [Line Items]
Net sales	$ 356.2	$ 348.7	$ 286.3