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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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation Of Revenue [Line Items]
Net sales	$ 528.6	$ 510.2	$ 1,008.2	$ 976.2
Chemicals
Disaggregation Of Revenue [Line Items]
Net sales	484.5	471.8	921.0	902.2
Point of Origin | Chemicals
Disaggregation Of Revenue [Line Items]
Net sales	484.5	471.8	921.0	902.2
Point of Origin | Chemicals | Germany
Disaggregation Of Revenue [Line Items]
Net sales	248.5	257.7	467.7	492.2
Point of Origin | Chemicals | United States
Disaggregation Of Revenue [Line Items]
Net sales	289.3	208.9	534.6	405.7
Point of Origin | Chemicals | Canada
Disaggregation Of Revenue [Line Items]
Net sales	95.9	82.2	174.4	153.8
Point of Origin | Chemicals | Belgium
Disaggregation Of Revenue [Line Items]
Net sales	77.7	68.9	147.4	138.6
Point of Origin | Chemicals | Norway
Disaggregation Of Revenue [Line Items]
Net sales	47.7	56.5	99.2	109.6
Point of Origin | Chemicals | Eliminations
Disaggregation Of Revenue [Line Items]
Net sales	(274.6)	(202.4)	(502.3)	(397.7)
Point of Destination | Chemicals
Disaggregation Of Revenue [Line Items]
Net sales	484.5	471.8	921.0	902.2
Point of Destination | Chemicals | Europe
Disaggregation Of Revenue [Line Items]
Net sales	229.4	238.5	444.6	472.4
Point of Destination | Chemicals | North America
Disaggregation Of Revenue [Line Items]
Net sales	161.5	143.6	308.3	270.6
Point of Destination | Chemicals | Other
Disaggregation Of Revenue [Line Items]
Net sales	$ 93.6	$ 89.7	$ 168.1	$ 159.2

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