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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