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Business Segments Business Segments (Details 2) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Segment Reporting Information [Line Items]      
Net sales $ 2,447.4 $ 2,352.4  
Cost of product sold (exclusive of depreciation and amortization) 2,076.9 1,813.6  
Direct operating expenses (exclusive of depreciation and amortization) 123.4 108.5  
Depreciation and amortization 37.3 34.2  
Operating income 183.5 367.7  
Capital expenditures 61.9 63.7  
Total assets 3,869.9   3,665.8
Goodwill 41.0   41.0
Petroleum
      
Segment Reporting Information [Line Items]      
Net sales 2,375.3 2,274.0  
Cost of product sold (exclusive of depreciation and amortization) 2,063.3 1,805.8  
Direct operating expenses (exclusive of depreciation and amortization) 99.2 86.0  
Depreciation and amortization 29.5 28.0  
Operating income 164.6 335.6  
Capital expenditures 57.9 44.6  
Total assets 2,769.4   2,533.3
Goodwill 0   0
Nitrogen Fertilizer
      
Segment Reporting Information [Line Items]      
Net sales 80.3 81.4  
Cost of product sold (exclusive of depreciation and amortization) 21.7 10.6  
Direct operating expenses (exclusive of depreciation and amortization) 24.2 22.6  
Depreciation and amortization 6.7 5.8  
Operating income 23.1 36.8  
Capital expenditures 3.4 18.1  
Total assets 592.6   593.5
Goodwill 41.0   41.0
Other
      
Segment Reporting Information [Line Items]      
Direct operating expenses (exclusive of depreciation and amortization) 0 (0.1)  
Depreciation and amortization 1.1 0.4  
Operating income (4.2) (4.7)  
Capital expenditures 0.6 1.0  
Total assets 507.9   539.0
Goodwill 0   0
Intersegment elimination
      
Segment Reporting Information [Line Items]      
Net sales (8.2) (3.0)  
Cost of product sold (exclusive of depreciation and amortization) $ (8.1) $ (2.8)