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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | $ 415.0 | $ 528.6 | $ 874.3 | $ 1,008.2
Chemicals |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 386.0 | 484.5 | 807.0 | 921.0
Point of Origin | Chemicals |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 386.0 | 484.5 | 807.0 | 921.0
Point of Origin | Chemicals | Germany |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 183.1 | 248.5 | 412.2 | 467.7
Point of Origin | Chemicals | United States |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 226.6 | 289.3 | 463.6 | 534.6
Point of Origin | Chemicals | Canada |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 85.6 | 95.9 | 153.3 | 174.4
Point of Origin | Chemicals | Belgium |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 50.9 | 77.7 | 117.0 | 147.4
Point of Origin | Chemicals | Norway |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 62.6 | 47.7 | 116.9 | 99.2
Point of Origin | Chemicals | Eliminations |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | (222.8) | (274.6) | (456.0) | (502.3)
Point of Destination | Chemicals |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 386.0 | 484.5 | 807.0 | 921.0
Point of Destination | Chemicals | Europe |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 169.8 | 229.4 | 384.3 | 444.6
Point of Destination | Chemicals | North America |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 148.9 | 161.5 | 281.2 | 308.3
Point of Destination | Chemicals | Other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | $ 67.3 | $ 93.6 | $ 141.5 | $ 168.1

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