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Revenue - Disaggregation of Sales - Schedule of Disaggregates of Net Sales of our Chemicals Segment (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation Of Revenue [Line Items]
Net sales	$ 525.3	$ 415.0	$ 1,034.3	$ 874.3
Chemicals
Disaggregation Of Revenue [Line Items]
Net sales	478.6	386.0	943.6	807.0
Point of Origin | Chemicals
Disaggregation Of Revenue [Line Items]
Net sales	478.6	386.0	943.6	807.0
Point of Origin | Chemicals | United States
Disaggregation Of Revenue [Line Items]
Net sales	236.0	226.6	489.9	463.6
Point of Origin | Chemicals | Germany
Disaggregation Of Revenue [Line Items]
Net sales	238.8	183.1	470.0	412.2
Point of Origin | Chemicals | Canada
Disaggregation Of Revenue [Line Items]
Net sales	103.0	85.6	200.2	153.3
Point of Origin | Chemicals | Belgium
Disaggregation Of Revenue [Line Items]
Net sales	75.9	50.9	142.4	117.0
Point of Origin | Chemicals | Norway
Disaggregation Of Revenue [Line Items]
Net sales	64.1	62.6	135.1	116.9
Point of Origin | Chemicals | Eliminations
Disaggregation Of Revenue [Line Items]
Net sales	(239.2)	(222.8)	(494.0)	(456.0)
Point of Destination | Chemicals
Disaggregation Of Revenue [Line Items]
Net sales	478.6	386.0	943.6	807.0
Point of Destination | Chemicals | Europe
Disaggregation Of Revenue [Line Items]
Net sales	236.8	169.8	464.1	384.3
Point of Destination | Chemicals | North America
Disaggregation Of Revenue [Line Items]
Net sales	157.3	148.9	302.6	281.2
Point of Destination | Chemicals | Other
Disaggregation Of Revenue [Line Items]
Net sales	$ 84.5	$ 67.3	$ 176.9	$ 141.5

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