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Disaggregation of sales - Schedule of Disaggregates of Net Sales of our Chemicals Segment (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disaggregation Of Revenue [Line Items] |  |  |
Net sales | $ 1,921.7 | $ 2,222.5 | $ 2,296.4
Point Of Origin | Operating Segment |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Net sales | 1,921.7 | 2,222.5 | 2,296.4
Point Of Origin | Operating Segment | United States |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Net sales | 1,284.4 | 1,518.9 | 1,409.1
Point Of Origin | Operating Segment | Germany |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Net sales | 726.4 | 895.4 | 971.7
Point Of Origin | Operating Segment | Canada |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Net sales | 351.0 | 389.4 | 371.9
Point Of Origin | Operating Segment | Belgium |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Net sales | 217.1 | 306.5 | 295.7
Point Of Origin | Operating Segment | Norway |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Net sales | 252.1 | 273.5 | 257.2
Point Of Origin | Eliminations |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Net sales | (909.3) | (1,161.2) | (1,009.2)
Point Of Destination | Operating Segment |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Net sales | 1,921.7 | 2,222.5 | 2,296.4
Point Of Destination | Operating Segment | Europe |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Net sales | 738.5 | 879.0 | 945.7
Point Of Destination | Operating Segment | North America |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Net sales | 871.0 | 985.4 | 999.7
Chemicals |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Net sales | 1,666.5 | 1,930.2 | 1,939.4
Chemicals | Point Of Origin | Operating Segment |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Net sales | 1,666.5 | 1,930.2 | 1,939.4
Chemicals | Point Of Origin | Operating Segment | United States |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Net sales | 1,029.2 | 1,226.6 | 1,052.1
Chemicals | Point Of Origin | Operating Segment | Germany |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Net sales | 726.4 | 895.4 | 971.7
Chemicals | Point Of Origin | Operating Segment | Canada |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Net sales | 351.0 | 389.4 | 371.9
Chemicals | Point Of Origin | Operating Segment | Belgium |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Net sales | 217.1 | 306.5 | 295.7
Chemicals | Point Of Origin | Operating Segment | Norway |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Net sales | 252.1 | 273.5 | 257.2
Chemicals | Point Of Origin | Eliminations |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Net sales | (909.3) | (1,161.2) | (1,009.2)
Chemicals | Point Of Destination | Operating Segment |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Net sales | 1,666.5 | 1,930.2 | 1,939.4
Chemicals | Point Of Destination | Operating Segment | Europe |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Net sales | 737.8 | 878.3 | 945.0
Chemicals | Point Of Destination | Operating Segment | North America |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Net sales | 618.1 | 695.7 | 645.7
Chemicals | Point Of Destination | Operating Segment | Other |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Net sales | $ 310.6 | $ 356.2 | $ 348.7

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