CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 70.2	$ 45.3
Accounts receivable, net	644.3us-gaap_AccountsReceivableNetCurrent	525.2us-gaap_AccountsReceivableNetCurrent
Inventory, net	1,172.1us-gaap_InventoryNet	586.6us-gaap_InventoryNet
Deferred tax assets, current	67.7	69.6
Other current assets	71.4us-gaap_OtherAssetsCurrent	46.5us-gaap_OtherAssetsCurrent
Total current assets	2,025.7us-gaap_AssetsCurrent	1,273.2us-gaap_AssetsCurrent
Property, plant and equipment	6,388.4us-gaap_PropertyPlantAndEquipmentGross	5,871.9us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation	(4,175.2)	(3,991.8)
Property, plant and equipment, net	2,213.2us-gaap_PropertyPlantAndEquipmentNet	1,880.1us-gaap_PropertyPlantAndEquipmentNet
Other non-current assets:
Investments in affiliates	388.7us-gaap_EquityMethodInvestments	214.1us-gaap_EquityMethodInvestments
Other non-current assets	230.9us-gaap_OtherAssetsNoncurrent	238.3us-gaap_OtherAssetsNoncurrent
TOTAL ASSETS	4,858.5us-gaap_Assets	3,605.7us-gaap_Assets
Current liabilities:
Accounts payable	803.1us-gaap_AccountsPayableCurrent	601.8us-gaap_AccountsPayableCurrent
Accrued liabilities	266.5us-gaap_AccruedLiabilitiesCurrent	142.9us-gaap_AccruedLiabilitiesCurrent
Current portion of long-term debt	0us-gaap_LongTermDebtCurrent	0.8us-gaap_LongTermDebtCurrent
Current portion of pension and other postretirement benefit obligations	55.6	85.9
Total current liabilities	1,125.2us-gaap_LiabilitiesCurrent	831.4us-gaap_LiabilitiesCurrent
Non-current liabilities:
Long-term debt	2,452.5us-gaap_LongTermDebtNoncurrent	1,506.2us-gaap_LongTermDebtNoncurrent
Pension and other postretirement benefit obligations	1,225.3	965.4
Other non-current liabilities	132.5us-gaap_OtherLiabilitiesNoncurrent	110.0us-gaap_OtherLiabilitiesNoncurrent
TOTAL LIABILITIES	4,935.5us-gaap_Liabilities	3,413.0us-gaap_Liabilities
Equity (deficit):
Common stock, authorized 300,000,000 shares of $.01 par value each; issued 177,362,600 and 149,691,388 shares in 2014 and 2013; outstanding 177,215,816 and 136,380,078 shares in 2014 and 2013	1.8us-gaap_CommonStockValue	1.5us-gaap_CommonStockValue
Additional paid-in capital	2,259.1	2,079.2
Treasury stock, common shares at cost, 146,784 and 13,311,310 shares in 2014 and 2013	(1.0)us-gaap_TreasuryStockValue	(174.0)us-gaap_TreasuryStockValue
Accumulated deficit	(2,548.0)	(2,451.1)
Accumulated other comprehensive income (loss)	(204.4)	323.4
Total stockholders' equity (deficit)	(492.5)us-gaap_StockholdersEquity	(221.0)us-gaap_StockholdersEquity
Noncontrolling interests	415.5us-gaap_MinorityInterest	413.7us-gaap_MinorityInterest
TOTAL EQUITY (DEFICIT)	(77.0)	192.7
TOTAL LIABILITIES AND EQUITY (DEFICIT)	4,858.5	3,605.7
Variable Interest Entity, Primary Beneficiary [Member] \| SunCoke Middletown [Member]
Current assets:
Cash and cash equivalents	18.2	14.2
Inventory, net	29.6	22.1
Property, plant and equipment	420.1	418.5
Accumulated depreciation	(43.3)	(29.0)
Other assets (liabilities), net	(0.3)	(0.7)
Current liabilities:
Accounts payable	10.6	13.3
Equity (deficit):
Noncontrolling interests	413.7	411.8
Variable Interest Entity, Primary Beneficiary [Member] \| Other Variable Interest Entities [Member]
Current assets:
Cash and cash equivalents	1.0	1.0
Property, plant and equipment	11.4	11.5
Accumulated depreciation	(9.3)	(9.2)
Other assets (liabilities), net	0.6	0.6
Equity (deficit):
Noncontrolling interests	$ 1.8	$ 1.9

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

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