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Revenue Recognition - Schedule of Disaggregates of Net Sales of our Chemicals Segment (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | $ 455.2 | $ 496.5 | $ 1,431.4 | $ 1,383.6
Chemicals |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 410.3 | 464.5 | 1,312.5 | 1,275.7
Point of Origin | Chemicals |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 410.3 | 464.5 | 1,312.5 | 1,275.7
Point of Origin | Chemicals | Germany |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 211.9 | 256.6 | 704.1 | 672.1
Point of Origin | Chemicals | United States |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 234.5 | 209.3 | 640.2 | 623.6
Point of Origin | Chemicals | Canada |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 82.3 | 70.4 | 236.1 | 228.2
Point of Origin | Chemicals | Belgium |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 66.4 | 75.6 | 205.0 | 205.7
Point of Origin | Chemicals | Norway |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 49.8 | 58.2 | 159.4 | 156.8
Point of Origin | Chemicals | Eliminations |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | (234.6) | (205.6) | (632.3) | (610.7)
Point of Destination | Chemicals |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 410.3 | 464.5 | 1,312.5 | 1,275.7
Point of Destination | Chemicals | Europe |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 191.8 | 246.0 | 664.2 | 652.3
Point of Destination | Chemicals | North America |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | 142.0 | 131.4 | 412.6 | 393.5
Point of Destination | Chemicals | Other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Net sales | $ 76.5 | $ 87.1 | $ 235.7 | $ 229.9

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