Business and Geographic Segments - Total Assets Held by Business Segments (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total assets	$ 2,709.6	$ 2,907.5	$ 2,443.2
Corporate and eliminations
Segment Reporting Information [Line Items]
Total assets	104.1	353.2	366.9
Chemicals | Operating Segment
Segment Reporting Information [Line Items]
Total assets	2,266.6	2,190.5	1,548.9
Component Products | Operating Segment
Segment Reporting Information [Line Items]
Total assets	120.4	104.9	97.9
Waste Management | Operating Segment
Segment Reporting Information [Line Items]
Total assets		52.0	228.6
Real Estate Management And Development | Operating Segment
Segment Reporting Information [Line Items]
Total assets	$ 218.5	$ 206.9	$ 200.9