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Disaggregation of Sales - Schedule of Disaggregates of Net Sales of our Chemicals Segment (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disaggregation Of Revenue [Line Items]                      
Net sales $ 414.1 $ 475.2 $ 528.6 $ 479.6 $ 388.7 $ 455.2 $ 510.2 $ 466.0 $ 1,897.5 $ 1,820.1 $ 1,879.4
Point of Origin                      
Disaggregation Of Revenue [Line Items]                      
Net sales                 1,897.5 1,820.1 1,879.4
Point of Origin | Germany                      
Disaggregation Of Revenue [Line Items]                      
Net sales                 883.6 886.1 918.6
Point of Origin | United States                      
Disaggregation Of Revenue [Line Items]                      
Net sales                 1,164.8 997.6 992.3
Point of Origin | Canada                      
Disaggregation Of Revenue [Line Items]                      
Net sales                 328.7 307.2 309.2
Point of Origin | Belgium                      
Disaggregation Of Revenue [Line Items]                      
Net sales                 270.7 272.2 279.9
Point of Origin | Norway                      
Disaggregation Of Revenue [Line Items]                      
Net sales                 192.2 209.6 216.4
Point of Origin | Eliminations                      
Disaggregation Of Revenue [Line Items]                      
Net sales                 (942.5) (852.6) (837.0)
Point of Destination                      
Disaggregation Of Revenue [Line Items]                      
Net sales                 1,897.5 1,820.1 1,879.4
Point of Destination | Europe                      
Disaggregation Of Revenue [Line Items]                      
Net sales                 824.2 817.6 899.2
Point of Destination | North America                      
Disaggregation Of Revenue [Line Items]                      
Net sales                 740.1 698.7 668.3
Chemicals                      
Disaggregation Of Revenue [Line Items]                      
Net sales                 1,731.2 1,661.9 1,729.0
Chemicals | Point of Origin                      
Disaggregation Of Revenue [Line Items]                      
Net sales                 1,731.2 1,661.9 1,729.0
Chemicals | Point of Origin | Germany                      
Disaggregation Of Revenue [Line Items]                      
Net sales                 883.6 886.1 918.6
Chemicals | Point of Origin | United States                      
Disaggregation Of Revenue [Line Items]                      
Net sales                 998.5 839.4 841.8
Chemicals | Point of Origin | Canada                      
Disaggregation Of Revenue [Line Items]                      
Net sales                 328.7 307.2 309.2
Chemicals | Point of Origin | Belgium                      
Disaggregation Of Revenue [Line Items]                      
Net sales                 270.7 272.2 279.9
Chemicals | Point of Origin | Norway                      
Disaggregation Of Revenue [Line Items]                      
Net sales                 192.2 209.6 216.4
Chemicals | Point of Origin | Eliminations                      
Disaggregation Of Revenue [Line Items]                      
Net sales                 (942.5) (852.6) (836.9)
Chemicals | Point of Destination                      
Disaggregation Of Revenue [Line Items]                      
Net sales                 1,731.2 1,661.9 1,729.0
Chemicals | Point of Destination | Europe                      
Disaggregation Of Revenue [Line Items]                      
Net sales                 823.5 817.2 898.8
Chemicals | Point of Destination | North America                      
Disaggregation Of Revenue [Line Items]                      
Net sales                 575.6 542.0 519.4
Chemicals | Point of Destination | Other                      
Disaggregation Of Revenue [Line Items]                      
Net sales                 $ 332.1 $ 302.7 $ 310.8