Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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The aggregate cost of goods produced and sold during the reporting period, excluding depreciation, depletion, and amortization.

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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The aggregate direct operating costs incurred during the reporting period.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

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Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

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Business Segments (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Net sales	$ 1,841.8us-gaap_SalesRevenueGoodsNet	$ 2,279.9us-gaap_SalesRevenueGoodsNet	$ 2,540.3us-gaap_SalesRevenueGoodsNet	$ 2,447.4us-gaap_SalesRevenueGoodsNet	$ 2,436.0us-gaap_SalesRevenueGoodsNet	$ 1,977.1us-gaap_SalesRevenueGoodsNet	$ 2,220.3us-gaap_SalesRevenueGoodsNet	$ 2,352.4us-gaap_SalesRevenueGoodsNet	$ 9,109.5us-gaap_SalesRevenueGoodsNet	$ 8,985.8us-gaap_SalesRevenueGoodsNet	$ 8,567.3us-gaap_SalesRevenueGoodsNet
Cost of product sold (exclusive of depreciation and amortization)	1,733.4	2,066.7	2,189.0	2,076.9	2,219.7	1,744.4	1,785.4	1,813.6	8,066.0	7,563.2	6,696.9
Direct operating expenses (exclusive of depreciation and amortization)	134.7us-gaap_DirectOperatingCosts	136.8us-gaap_DirectOperatingCosts	120.1us-gaap_DirectOperatingCosts	123.4us-gaap_DirectOperatingCosts	110.6us-gaap_DirectOperatingCosts	128.4us-gaap_DirectOperatingCosts	108.3us-gaap_DirectOperatingCosts	108.5us-gaap_DirectOperatingCosts	515.1us-gaap_DirectOperatingCosts	455.8us-gaap_DirectOperatingCosts	522.1us-gaap_DirectOperatingCosts
Depreciation and amortization	40.8	37.8	38.6	37.3	37.4	36.2	35.0	34.2	154.4	142.8	130.0
Operating income	(90.6)us-gaap_OperatingIncomeLoss	6.8us-gaap_OperatingIncomeLoss	164.6us-gaap_OperatingIncomeLoss	183.5us-gaap_OperatingIncomeLoss	39.7us-gaap_OperatingIncomeLoss	40.4us-gaap_OperatingIncomeLoss	262.7us-gaap_OperatingIncomeLoss	367.7us-gaap_OperatingIncomeLoss	264.3us-gaap_OperatingIncomeLoss	710.5us-gaap_OperatingIncomeLoss	1,034.9us-gaap_OperatingIncomeLoss
Capital expenditures									218.4	256.5	212.2
Total assets	3,462.5us-gaap_Assets				3,665.8us-gaap_Assets				3,462.5us-gaap_Assets	3,665.8us-gaap_Assets	3,610.9us-gaap_Assets
Goodwill	41.0us-gaap_Goodwill				41.0us-gaap_Goodwill				41.0us-gaap_Goodwill	41.0us-gaap_Goodwill	41.0us-gaap_Goodwill
Petroleum
Segment Reporting Information [Line Items]
Net sales									8,829.7	8,683.5	8,281.5
Cost of product sold (exclusive of depreciation and amortization)									8,013.4	7,526.7	6,667.3
Direct operating expenses (exclusive of depreciation and amortization)									416.0	361.7	426.5
Depreciation and amortization									122.5	114.3	107.6
Operating income									207.2	603.0	1,012.5
Capital expenditures									191.3	204.5	120.0
Total assets	2,417.8				2,533.3				2,417.8	2,533.3	2,258.5
Goodwill	0				0				0	0	0
Nitrogen Fertilizer
Segment Reporting Information [Line Items]
Net sales									298.7	323.7	302.3
Cost of product sold (exclusive of depreciation and amortization)									72.0	58.1	46.1
Direct operating expenses (exclusive of depreciation and amortization)									98.9	94.1	95.6
Depreciation and amortization									27.3	25.6	20.7
Operating income									82.8	124.9	115.8
Capital expenditures									21.1	43.8	82.2
Total assets	578.8				593.5				578.8	593.5	623.0
Goodwill	41.0				41.0				41.0	41.0	41.0
Intersegment elimination
Segment Reporting Information [Line Items]
Net sales									(18.9)	(21.4)	(16.5)
Cost of product sold (exclusive of depreciation and amortization)									(19.4)	(21.6)	(16.5)
Other
Segment Reporting Information [Line Items]
Direct operating expenses (exclusive of depreciation and amortization)									0.2	0	0
Depreciation and amortization									4.6	2.9	1.7
Operating income									(25.7)	(17.4)	(93.4)
Capital expenditures									6.0	8.2	10.0
Total assets	465.9				539.0				465.9	539.0	729.4
Goodwill	$ 0				$ 0				$ 0	$ 0	$ 0