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Business Segments (Details 2) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Net sales	$ 1,010.6	$ 1,408.8	$ 1,624.2	$ 1,388.9	$ 1,841.8	$ 2,279.9	$ 2,540.3	$ 2,447.4	$ 5,432.5	$ 9,109.5	$ 8,985.8
Cost of product sold (exclusive of depreciation and amortization)	847.9	1,076.7	1,192.2	1,073.6	1,733.4	2,066.7	2,189.0	2,076.9	4,190.4	8,066.0	7,563.2
Direct operating expenses (exclusive of depreciation and amortization)	212.1	145.8	115.4	111.4	134.7	136.8	120.1	123.4	584.7	515.1	455.8
Depreciation and amortization	40.9	38.7	42.5	42.0	40.8	37.8	38.6	37.3	164.1	154.4	142.8
Operating income	(110.7)	$ 121.5	$ 274.2	$ 136.6	(90.6)	$ 6.8	$ 164.6	$ 183.5	421.6	264.3	710.5
Capital expenditures									218.7	218.4	256.5
Total assets	3,305.8				3,462.5				3,305.8	3,462.5	3,665.8
Goodwill	41.0				41.0				41.0	41.0	41.0
Operating Segments | Petroleum
Segment Reporting Information [Line Items]
Net sales									5,161.9	8,829.7	8,683.5
Cost of product sold (exclusive of depreciation and amortization)									4,143.6	8,013.4	7,526.7
Direct operating expenses (exclusive of depreciation and amortization)									478.5	416.0	361.7
Depreciation and amortization									130.2	122.5	114.3
Operating income									361.7	207.2	603.0
Capital expenditures									194.7	191.3	204.5
Total assets	2,195.2				2,417.8				2,195.2	2,417.8	2,533.3
Goodwill	0.0				0.0				0.0	0.0	0.0
Operating Segments | Nitrogen Fertilizer
Segment Reporting Information [Line Items]
Net sales									289.2	298.7	323.7
Cost of product sold (exclusive of depreciation and amortization)									65.2	72.0	58.1
Direct operating expenses (exclusive of depreciation and amortization)									106.1	98.9	94.1
Depreciation and amortization									28.4	27.3	25.6
Operating income									68.7	82.8	124.9
Capital expenditures									17.0	21.1	43.8
Total assets	536.5				578.8				536.5	578.8	593.5
Goodwill	41.0				41.0				41.0	41.0	41.0
Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales									(18.6)	(18.9)	(21.4)
Cost of product sold (exclusive of depreciation and amortization)									(18.4)	(19.4)	(21.6)
Intersegment Eliminations | Petroleum
Segment Reporting Information [Line Items]
Net sales									6.8	8.7	9.6
Cost of product sold (exclusive of depreciation and amortization)									11.8	10.1	11.4
Intersegment Eliminations | Nitrogen Fertilizer
Segment Reporting Information [Line Items]
Net sales									11.8	10.1	11.4
Cost of product sold (exclusive of depreciation and amortization)									6.6	9.2	9.8
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Direct operating expenses (exclusive of depreciation and amortization)									0.1	0.2	0.0
Depreciation and amortization									5.5	4.6	2.9
Operating income									(8.8)	(25.7)	(17.4)
Capital expenditures									7.0	6.0	8.2
Total assets	574.1				465.9				574.1	465.9	539.0
Goodwill	$ 0.0				$ 0.0				$ 0.0	$ 0.0	$ 0.0

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