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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, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | $ 634.6 | $ 525.3 | $ 1,263.6 | $ 1,034.3
Chemicals |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 565.3 | 478.6 | 1,128.2 | 943.6
Point of Origin | Chemicals |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 565.3 | 478.6 | 1,128.2 | 943.6
Point of Origin | Chemicals | United States |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 323.7 | 236.0 | 650.1 | 489.9
Point of Origin | Chemicals | Germany |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 272.0 | 238.8 | 548.5 | 470.0
Point of Origin | Chemicals | Canada |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 111.6 | 103.0 | 208.0 | 200.2
Point of Origin | Chemicals | Belgium |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 87.5 | 75.9 | 180.3 | 142.4
Point of Origin | Chemicals | Norway |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 68.0 | 64.1 | 146.4 | 135.1
Point of Origin | Chemicals | Eliminations |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | (297.5) | (239.2) | (605.1) | (494.0)
Point of Destination | Chemicals |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 565.3 | 478.6 | 1,128.2 | 943.6
Point of Destination | Chemicals | Europe |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 264.6 | 236.8 | 534.1 | 464.1
Point of Destination | Chemicals | North America |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 196.0 | 157.3 | 375.9 | 302.6
Point of Destination | Chemicals | Other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | $ 104.7 | $ 84.5 | $ 218.2 | $ 176.9

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