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Business Segment Information - Segment Operating Performance (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Segment Reporting Information [Line Items]    
Net sales $ 466.0 $ 405.3
Cost of sales 280.7 288.7
Gross margin 185.3 116.6
Operating income 118.8 64.1
Securities earnings 8.3 7.0
Insurance recoveries 0.2 0.1
Gain on land sales 12.5  
Other components of net periodic pension and OPEB expense (3.7) (4.1)
General expenses, net (14.3) (10.5)
Interest expense (15.4) (14.5)
Income from continuing operations before income taxes 106.4 42.1
Chemicals    
Segment Reporting Information [Line Items]    
Net sales 430.4 369.8
Cost of sales 256.1 264.2
Gross margin 174.3 105.6
Operating income 110.6 59.1
Component Products    
Segment Reporting Information [Line Items]    
Net sales 28.4 29.9
Cost of sales 18.9 20.3
Gross margin 9.5 9.6
Operating income 4.4 4.5
Real Estate Management And Development    
Segment Reporting Information [Line Items]    
Net sales 7.2 5.6
Cost of sales 5.7 4.2
Gross margin 1.5 1.4
Operating income $ 3.8 $ 0.5