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Business Segments (Details 2) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Segment Reporting Information [Line Items]          
Net sales $ 2,279.9 $ 1,977.1 $ 7,267.7 $ 6,549.8  
Cost of product sold (exclusive of depreciation and amortization) 2,066.7 1,744.4 6,332.6 5,343.5  
Direct operating expenses (exclusive of depreciation and amortization) 136.8 128.4 380.3 345.2  
Depreciation and amortization 37.8 36.2 113.7 105.4  
Operating income 6.8 40.4 354.9 670.7  
Capital expenditures 56.5 69.0 171.4 183.6  
Total assets 3,752.4   3,752.4   3,665.8
Goodwill 41.0   41.0   41.0
Operating Segments | Petroleum
          
Segment Reporting Information [Line Items]          
Net sales 2,215.2 1,910.5 7,056.9 6,322.6  
Cost of product sold (exclusive of depreciation and amortization) 2,053.7 1,734.7 6,289.6 5,317.0  
Direct operating expenses (exclusive of depreciation and amortization) 110.6 104.7 303.0 274.5  
Depreciation and amortization 29.7 28.8 89.9 85.2  
Operating income 3.9 23.4 320.4 588.1  
Capital expenditures 48.9 60.7 154.2 140.8  
Total assets 2,691.7   2,691.7   2,533.3
Goodwill 0   0   0
Operating Segments | Nitrogen Fertilizer
          
Segment Reporting Information [Line Items]          
Net sales 66.7 69.2 224.3 239.4  
Cost of product sold (exclusive of depreciation and amortization) 15.4 13.0 56.6 39.2  
Direct operating expenses (exclusive of depreciation and amortization) 26.1 23.7 77.2 70.7  
Depreciation and amortization 6.8 6.6 20.3 18.5  
Operating income 14.4 21.3 56.3 95.2  
Capital expenditures 6.0 4.0 13.5 35.8  
Total assets 562.1   562.1   593.5
Goodwill 41.0   41.0   41.0
Intersegment elimination
          
Segment Reporting Information [Line Items]          
Net sales (2.0) (2.6) (13.5) (12.2)  
Cost of product sold (exclusive of depreciation and amortization) (2.4) (3.3) (13.6) (12.7)  
Other
          
Segment Reporting Information [Line Items]          
Direct operating expenses (exclusive of depreciation and amortization) 0.1 0 0.1 0  
Depreciation and amortization 1.3 0.8 3.5 1.7  
Operating income (11.5) (4.3) (21.8) (12.6)  
Capital expenditures 1.6 4.3 3.7 7.0  
Total assets 498.6   498.6   539.0
Goodwill $ 0   $ 0   $ 0