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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
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Disaggregation Of Revenue [Line Items] |  |
Net sales | $ 479.6 | $ 466.0
Chemicals |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 436.5 | 430.4
Point of Origin | Chemicals |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 436.5 | 430.4
Point of Origin | Chemicals | Germany |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 219.2 | 234.5
Point of Origin | Chemicals | United States |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 245.3 | 196.8
Point of Origin | Chemicals | Canada |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 78.5 | 71.6
Point of Origin | Chemicals | Belgium |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 69.7 | 69.7
Point of Origin | Chemicals | Norway |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 51.5 | 53.1
Point of Origin | Chemicals | Eliminations |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | (227.7) | (195.3)
Point of Destination | Chemicals |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 436.5 | 430.4
Point of Destination | Chemicals | Europe |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 215.2 | 233.9
Point of Destination | Chemicals | North America |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | 146.8 | 127.0
Point of Destination | Chemicals | Other |  |
Disaggregation Of Revenue [Line Items] |  |
Net sales | $ 74.5 | $ 69.5

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