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Business Segments (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
segment
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting [Abstract]                      
Number of reportable segments                 2    
Business Segments                      
Net sales $ 2,436.0 $ 1,977.1 $ 2,220.3 $ 2,352.4 $ 1,880.8 $ 2,409.6 $ 2,308.3 $ 1,968.6 $ 8,985.8 $ 8,567.3 $ 5,029.1
Cost of product sold (exclusive of depreciation and amortization) 2,219.7 1,744.4 1,785.4 1,813.6 1,485.1 1,702.5 1,874.2 1,635.2 7,563.2 6,696.9 3,943.5
Direct operating expenses (exclusive of depreciation and amortization) 110.6 128.4 108.3 108.5 202.5 109.9 94.1 115.5 455.8 522.1 334.1
Depreciation and amortization 37.4 36.2 35.0 34.2 32.6 33.1 32.2 32.1 142.8 130.0 90.3
Operating income 39.7 40.4 262.7 367.7 124.9 533.7 235.8 140.5 710.5 1,034.9 566.6
Capital expenditures                 256.5 212.2 91.2
Total assets 3,665.8       3,610.9       3,665.8 3,610.9 3,119.3
Goodwill 41.0       41.0       41.0 41.0 41.0
Petroleum
                      
Business Segments                      
Intercompany sales                 9.6 9.9 11.4
Intercompany cost of product sold (exclusive of depreciation and amortization)                 11.4 6.1 13.2
Net sales                 8,683.5 8,281.5 4,751.8
Cost of product sold (exclusive of depreciation and amortization)                 7,526.7 6,667.3 3,926.6
Direct operating expenses (exclusive of depreciation and amortization)                 361.7 426.5 247.7
Depreciation and amortization                 114.3 107.6 69.9
Operating income                 603.0 1,012.5 465.7
Capital expenditures                 204.5 120.0 68.6
Total assets 2,533.3       2,258.5       2,533.3 2,258.5 2,322.1
Goodwill 0       0       0 0 0
Petroleum | Hydrogen
                      
Business Segments                      
Intercompany sales                 0.6    
Nitrogen Fertilizer
                      
Business Segments                      
Intercompany sales                 11.4 6.3 14.2
Intercompany cost of product sold (exclusive of depreciation and amortization)                 9.8 10.2 10.7
Cost of product sold related to the transfer of excess hydrogen                 0.6 0.2 1.0
Net sales                 323.7 302.3 302.9
Cost of product sold (exclusive of depreciation and amortization)                 58.1 46.1 42.5
Direct operating expenses (exclusive of depreciation and amortization)                 94.1 95.6 86.5
Depreciation and amortization                 25.6 20.7 18.9
Operating income                 124.9 115.8 136.2
Capital expenditures                 43.8 82.2 19.1
Total assets 593.5       623.0       593.5 623.0 659.3
Goodwill 41.0       41.0       41.0 41.0 41.0
Other
                      
Business Segments                      
Direct operating expenses (exclusive of depreciation and amortization)                 0 0 (0.1)
Depreciation and amortization                 2.9 1.7 1.5
Operating income                 (17.4) (93.4) (35.3)
Capital expenditures                 8.2 10.0 3.5
Total assets 539.0       729.4       539.0 729.4 137.9
Goodwill 0       0       0 0 0
Intersegment elimination
                      
Business Segments                      
Net sales                 (21.4) (16.5) (25.6)
Cost of product sold (exclusive of depreciation and amortization)                 $ (21.6) $ (16.5) $ (25.6)