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Business Segments (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Segment Reporting [Abstract]        
Number of reportable segments     2  
Petroleum
       
Segment Reporting Information [Line Items]        
Intercompany sales $ 1.9 $ 1.6 $ 6.5 $ 7.0
Intercompany cost of product sold (exclusive of depreciation and amortization) 0.1 0.8 6.9 4.7
Petroleum | Hydrogen
       
Segment Reporting Information [Line Items]        
Intercompany sales 0 0.3 0 0.6
Nitrogen Fertilizer
       
Segment Reporting Information [Line Items]        
Intercompany sales 0.1 0.8 6.9 4.7
Intercompany cost of product sold (exclusive of depreciation and amortization) 2.1 2.2 6.6 7.4
Cost of product sold related to the transfer of excess hydrogen $ 0 $ 0.3 $ 0 $ 0.6