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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

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