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Business Segment Information - Segment Operating Performance (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Segment Reporting Information [Line Items]        
Net sales $ 448.2 $ 508.8 $ 1,463.4 $ 1,659.9
Cost of sales 399.6 411.3 1,384.7 1,140.0
Gross margin 48.6 97.5 78.7 519.9
Operating income (loss) (42.5) 41.1 (134.5) 347.6
Equity in earnings of investees     (0.9) (0.1)
Securities earnings 6.6 7.3 19.9 21.5
Insurance recoveries 2.2 1.2 3.8 2.6
Litigation settlement gain       14.7
Loss on prepayment of debt (2.3)   (8.9) (7.2)
General expenses, net (10.1) (7.9) (41.4) (37.4)
Interest expense (13.7) (14.6) (43.8) (42.4)
Income (loss) from continuing operations before income taxes (59.8) 27.0 (205.7) 299.3
Chemicals
        
Segment Reporting Information [Line Items]        
Net sales 419.1 472.9 1,363.8 1,579.5
Cost of sales 372.4 387.5 1,304.8 1,070.5
Gross margin 46.7 85.4 59.0 509.0
Operating income (loss) (35.2) 40.4 (125.6) 364.1
Component products
        
Segment Reporting Information [Line Items]        
Net sales 24.2 21.4 69.7 63.9
Cost of sales 16.7 15.1 48.6 45.1
Gross margin 7.5 6.3 21.1 18.8
Operating income (loss) 3.0 1.7 7.4 5.4
Waste management
        
Segment Reporting Information [Line Items]        
Net sales 4.9 14.5 29.9 16.5
Cost of sales 10.5 8.7 31.3 24.4
Gross margin (5.6) 5.8 (1.4) (7.9)
Operating income (loss) (10.3) (1.0) (16.3) (21.9)
Corporate Segment
        
Segment Reporting Information [Line Items]        
Equity in earnings of investees   $ (0.1) $ (0.8) $ (0.1)