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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		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenue - disaggregation of sales [Line Items]
Net sales	$ 533.6	$ 468.9	$ 1,623.9	$ 1,468.7
Chemicals
Revenue - disaggregation of sales [Line Items]
Net sales	484.7	396.9	1,464.0	1,266.4
Point of Origin | Chemicals
Revenue - disaggregation of sales [Line Items]
Net sales	484.7	396.9	1,464.0	1,266.4
Point of Origin | Chemicals | Eliminations
Revenue - disaggregation of sales [Line Items]
Net sales	(244.5)	(219.0)	(680.4)	(654.6)
Point of Origin | Chemicals | Operating Segment | United States
Revenue - disaggregation of sales [Line Items]
Net sales	290.0	250.6	810.6	739.8
Point of Origin | Chemicals | Operating Segment | Germany
Revenue - disaggregation of sales [Line Items]
Net sales	217.4	182.3	645.8	561.9
Point of Origin | Chemicals | Operating Segment | Canada
Revenue - disaggregation of sales [Line Items]
Net sales	90.9	93.0	277.8	267.8
Point of Origin | Chemicals | Operating Segment | Norway
Revenue - disaggregation of sales [Line Items]
Net sales	66.3	40.7	215.0	187.9
Point of Origin | Chemicals | Operating Segment | Belgium
Revenue - disaggregation of sales [Line Items]
Net sales	64.6	49.3	195.2	163.6
Point of Destination | Chemicals
Revenue - disaggregation of sales [Line Items]
Net sales	484.7	396.9	1,464.0	1,266.4
Point of Destination | Chemicals | Operating Segment | Europe
Revenue - disaggregation of sales [Line Items]
Net sales	228.1	179.9	665.6	580.0
Point of Destination | Chemicals | Operating Segment | North America
Revenue - disaggregation of sales [Line Items]
Net sales	179.8	165.1	528.3	466.7
Point of Destination | Chemicals | Operating Segment | Other
Revenue - disaggregation of sales [Line Items]
Net sales	$ 76.8	$ 51.9	$ 270.1	$ 219.7

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