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Business Segments (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
segment
Sep. 30, 2012
Dec. 31, 2012
Segment Reporting [Abstract]          
Number of reportable segments     2    
Business Segments          
Net sales $ 1,977.1 $ 2,409.6 $ 6,549.8 $ 6,686.5  
Cost of product sold (exclusive of depreciation and amortization) 1,744.4 1,702.5 5,343.5 5,211.9  
Direct operating expenses (exclusive of depreciation and amortization) 128.4 109.9 345.2 319.5  
Depreciation and amortization 36.2 33.1 105.4 97.4  
Operating income 40.4 533.7 670.7 910.0  
Capital expenditures 69.0 39.9 183.6 145.0  
Total assets 3,875.1   3,875.1   3,610.9
Goodwill 41.0   41.0   41.0
Petroleum
          
Business Segments          
Intercompany sales 1.6 2.4 7.0 7.3  
Intercompany cost of product sold (exclusive of depreciation and amortization) 0.8 0.2 4.7 5.8  
Net sales 1,910.5 2,337.3 6,322.6 6,465.3  
Cost of product sold (exclusive of depreciation and amortization) 1,734.7 1,694.0 5,317.0 5,190.8  
Direct operating expenses (exclusive of depreciation and amortization) 104.7 88.8 274.5 253.1  
Depreciation and amortization 28.8 27.5 85.2 80.4  
Operating income 23.4 507.5 588.1 891.2  
Capital expenditures 60.7 20.2 140.8 82.8  
Total assets 2,686.5   2,686.5   2,258.5
Goodwill 0   0   0
Petroleum | Hydrogen
          
Business Segments          
Intercompany sales 0.3 0 0.6 0  
Nitrogen Fertilizer
          
Business Segments          
Intercompany sales 0.8 0.3 4.7 6.0  
Intercompany cost of product sold (exclusive of depreciation and amortization) 2.2 2.5 7.4 7.8  
Cost of product sold related to the transfer of excess hydrogen 0.3 0.1 0.6 0.2  
Net sales 69.2 75.0 239.4 234.7  
Cost of product sold (exclusive of depreciation and amortization) 13.0 11.3 39.2 34.6  
Direct operating expenses (exclusive of depreciation and amortization) 23.7 21.1 70.7 66.4  
Depreciation and amortization 6.6 5.2 18.5 15.8  
Operating income 21.3 32.3 95.2 99.8  
Capital expenditures 4.0 18.2 35.8 57.4  
Total assets 594.0   594.0   623.0
Goodwill 41.0   41.0   41.0
Intersegment elimination
          
Business Segments          
Net sales (2.6) (2.7) (12.2) (13.5)  
Cost of product sold (exclusive of depreciation and amortization) (3.3) (2.8) (12.7) (13.5)  
Other
          
Business Segments          
Direct operating expenses (exclusive of depreciation and amortization) 0 0 0 0  
Depreciation and amortization 0.8 0.4 1.7 1.2  
Operating income (4.3) (6.1) (12.6) (81.0)  
Capital expenditures 4.3 1.5 7.0 4.8  
Total assets 594.6   594.6   729.4
Goodwill $ 0   $ 0   $ 0