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Business Segment Information (Details 1) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Segment Operating Performance        
Net sales $ 583.8 $ 573.1 $ 1,181.7 $ 1,028.8
Cost of sales 418.3 372.4 752.3 679.2
Gross margin 165.5 200.7 429.4 349.6
Operating income (loss) 105.0 139.8 309.6 243.1
Equity in earnings of investee (0.1) (0.1)   (0.2)
Securities earnings 7.1 7.4 14.2 14.8
Insurance recoveries 0.3 0.1 1.4 0.5
Litigation settlement gain 14.7   14.7  
General expenses, net (9.2) (16.8) (29.5) (23.4)
Loss on prepayment of debt (7.2)   (7.2) (3.3)
Interest expense (14.4) (15.9) (27.9) (33.1)
Income before income taxes 96.2 114.5 275.3 198.4
Chemicals [Member]
        
Segment Operating Performance        
Net sales 545.3 537.6 1,106.6 958.0
Cost of sales 382.6 341.2 683.0 615.8
Gross margin 162.7 196.4 423.6 342.2
Operating income (loss) 112.4 145.9 323.7 249.4
Component Products [Member]
        
Segment Operating Performance        
Net sales 37.6 35.2 73.1 70.0
Cost of sales 27.6 25.4 53.6 51.5
Gross margin 10.0 9.8 19.5 18.5
Operating income (loss) 3.9 3.1 6.8 11.9
Waste Management [Member]
        
Segment Operating Performance        
Net sales 0.9 0.3 2.0 0.8
Cost of sales 8.1 5.8 15.7 11.9
Gross margin (7.2) (5.5) (13.7) (11.1)
Operating income (loss) $ (11.3) $ (9.2) $ (20.9) $ (18.2)