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Business and Geographic Segments - Total Assets Held by Business Segments (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Segment Reporting Information [Line Items] |  |  |
Total assets | $ 2,907.5 | $ 2,443.2 | $ 2,537.4
Corporate and eliminations |  |  |
Segment Reporting Information [Line Items] |  |  |
Total assets | 353.2 | 366.9 | 366.3
Chemicals | Operating Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Total assets | 2,190.5 | 1,548.9 | 1,617.6
Component Products | Operating Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Total assets | 104.9 | 97.9 | 88.7
Waste Management | Operating Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Total assets | 52.0 | 228.6 | 231.9
Real Estate Management And Development | Operating Segment |  |  |
Segment Reporting Information [Line Items] |  |  |
Total assets | $ 206.9 | $ 200.9 | $ 232.9

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