Supplemental Guarantor Information (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	3 Months Ended								12 Months Ended
	Sep. 16, 2014	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	Dec. 31, 2011	Dec. 31, 2010
Condensed Statements of Operations [Abstract]
Net sales		$ 1,997.6	$ 1,593.8	$ 1,530.8	$ 1,383.5	$ 1,464.8	$ 1,331.3	$ 1,404.5	$ 1,369.8	$ 6,505.7	$ 5,570.4	$ 5,933.7
Cost of products sold (exclusive of items shown separately below)										6,007.7	5,107.8	5,539.1
Selling and administrative expenses (exclusive of items shown separately below)										247.2	205.3	208.7
Depreciation										201.9	190.1	192.0
Pension and OPEB expense (income) (exclusive of corridor charges shown below)										(92.5)	(68.6)	(35.3)
Pension corridor charge		2.0								2.0	0	157.3
Total operating costs										6,366.3	5,434.6	6,061.8
Operating profit (loss)		74.5	63.7	36.5	(35.3)	63.0	25.9	13.7	33.2	139.4	135.8	(128.1)
Interest expense										144.7	127.4	86.7
Other income (expense)										(21.1)	(1.4)	6.2
Income (loss) before income taxes										(26.4)	7.0	(208.6)
Income tax expense (benefit)										7.7	(10.4)	790.0
Equity in net income (loss) of subsidiaries										0	0	0
Net income (loss)										(34.1)	17.4	(998.6)
Less: Net income attributable to noncontrolling interests										62.8	64.2	28.7
Net income (loss) attributable to AK Steel Holding Corporation		13.5	(7.2)	(17.1)	(86.1)	35.2	(31.7)	(40.4)	(9.9)	(96.9)	(46.8)	(1,027.3)
Other comprehensive income (loss)										(527.8)	322.3	(1.6)
Comprehensive income (loss) attributable to AK Steel Holding Corporation										(624.7)	275.5	(1,028.9)
Current assets:
Cash and cash equivalents		70.2				45.3				70.2	45.3	227.0
Accounts receivable, net		644.3				525.2				644.3	525.2
Inventory, net		1,172.1				586.6				1,172.1	586.6
Deferred tax assets, current		67.7				69.6				67.7	69.6
Other current assets		71.4				46.5				71.4	46.5
Total current assets		2,025.7				1,273.2				2,025.7	1,273.2
Property, plant and equipment		6,388.4				5,871.9				6,388.4	5,871.9
Accumulated depreciation		(4,175.2)				(3,991.8)				(4,175.2)	(3,991.8)
Property, plant and equipment, net		2,213.2				1,880.1				2,213.2	1,880.1
Other non-current assets:
Investments in affiliates		388.7				214.1				388.7	214.1
Investment in subsidiaries		0				0				0	0
Inter-company accounts		0				0				0	0
Other non-current assets		230.9				238.3				230.9	238.3
TOTAL ASSETS		4,858.5				3,605.7				4,858.5	3,605.7
Current liabilities:
Accounts payable		803.1				601.8				803.1	601.8
Accrued liabilities		266.5				142.9				266.5	142.9
Current portion of long-term debt		0				0.8				0	0.8
Current portion of pension and other postretirement benefit obligations		55.6				85.9				55.6	85.9
Total current liabilities		1,125.2				831.4				1,125.2	831.4
Non-current liabilities:
Long-term debt		2,452.5				1,506.2				2,452.5	1,506.2
Pension and other postretirement benefit obligations		1,225.3				965.4				1,225.3	965.4
Other non-current liabilities		132.5				110.0				132.5	110.0
TOTAL LIABILITIES		4,935.5				3,413.0				4,935.5	3,413.0
Equity (deficit):
Total stockholders' equity (deficit)		(492.5)				(221.0)				(492.5)	(221.0)
Noncontrolling interests		415.5				413.7				415.5	413.7
TOTAL EQUITY (DEFICIT)		(77.0)				192.7				(77.0)	192.7	(91.0)	377.2
TOTAL LIABILITIES AND EQUITY (DEFICIT)		4,858.5				3,605.7				4,858.5	3,605.7
Condensed Cash Flows [Abstract]
Net cash flows from operating activities										(322.8)	(110.2)	(270.8)
Cash flows from investing activities:
Capital investments										(81.1)	(63.6)	(64.1)
Investments in Magnetation joint venture										(100.0)	(50.0)	(60.6)
Investments in acquired business, net of cash acquired										(690.3)	0	0
Other investing items, net										13.6	15.1	6.1
Net cash flows from investing activities										(857.8)	(98.5)	(118.6)
Cash flows from financing activities:
Net borrowings (repayments) under credit facility										515.0	90.0	(250.0)
Proceeds from issuance of long-term debt										427.1	31.9	873.3
Redemption of long-term debt										(0.8)	(27.4)	(74.0)
Proceeds from issuance of common stock	345.3									345.3	0	96.4
Debt issuance costs										(15.5)	(3.4)	(22.3)
Common stock dividends paid										0	0	(11.0)
Inter-company activity										0	0	0
SunCoke Middletown distributions to noncontrolling interest owners										(61.0)	(64.8)	(36.6)
Other financing items, net										(4.6)	0.7	(1.4)
Net cash flows from financing activities										1,205.5	27.0	574.4
Net increase (decrease) in cash and cash equivalents										24.9	(181.7)	185.0
Cash and cash equivalents, beginning of year					45.3				227.0	45.3	227.0	42.0
Cash and cash equivalents, end of year		70.2				45.3				70.2	45.3	227.0
AK Holding [Member]
Condensed Statements of Operations [Abstract]
Net sales										0	0	0
Cost of products sold (exclusive of items shown separately below)										0	0	0
Selling and administrative expenses (exclusive of items shown separately below)										4.6	4.4	4.4
Depreciation										0	0	0
Pension and OPEB expense (income) (exclusive of corridor charges shown below)										0	0	0
Pension corridor charge										0		0
Total operating costs										4.6	4.4	4.4
Operating profit (loss)										(4.6)	(4.4)	(4.4)
Interest expense										0	0	0
Other income (expense)										0	0	0
Income (loss) before income taxes										(4.6)	(4.4)	(4.4)
Income tax expense (benefit)										0	0	0
Equity in net income (loss) of subsidiaries										(92.3)	(42.4)	(1,022.9)
Net income (loss)										(96.9)	(46.8)	(1,027.3)
Less: Net income attributable to noncontrolling interests										0	0	0
Net income (loss) attributable to AK Steel Holding Corporation										(96.9)	(46.8)	(1,027.3)
Other comprehensive income (loss)										(527.8)	322.3	(1.6)
Comprehensive income (loss) attributable to AK Steel Holding Corporation										(624.7)	275.5	(1,028.9)
Current assets:
Cash and cash equivalents		0				0				0	0	0		0
Accounts receivable, net		0				0				0	0
Inventory, net		0				0				0	0
Deferred tax assets, current		0				0				0	0
Other current assets		0.3				0.3				0.3	0.3
Total current assets		0.3				0.3				0.3	0.3
Property, plant and equipment		0				0				0	0
Accumulated depreciation		0				0				0	0
Property, plant and equipment, net		0				0				0	0
Other non-current assets:
Investments in affiliates		0				0				0	0
Investment in subsidiaries		(2,970.9)				(2,772.4)				(2,970.9)	(2,772.4)
Inter-company accounts		2,478.1				2,551.1				2,478.1	2,551.1
Other non-current assets		0				0				0	0
TOTAL ASSETS		(492.5)				(221.0)				(492.5)	(221.0)
Current liabilities:
Accounts payable		0				0				0	0
Accrued liabilities		0				0				0	0
Current portion of long-term debt						0					0
Current portion of pension and other postretirement benefit obligations		0				0				0	0
Total current liabilities		0				0				0	0
Non-current liabilities:
Long-term debt		0				0				0	0
Pension and other postretirement benefit obligations		0				0				0	0
Other non-current liabilities		0				0				0	0
TOTAL LIABILITIES		0				0				0	0
Equity (deficit):
Total stockholders' equity (deficit)		(492.5)				(221.0)				(492.5)	(221.0)
Noncontrolling interests		0				0				0	0
TOTAL EQUITY (DEFICIT)		(492.5)				(221.0)				(492.5)	(221.0)
TOTAL LIABILITIES AND EQUITY (DEFICIT)		(492.5)				(221.0)				(492.5)	(221.0)
Condensed Cash Flows [Abstract]
Net cash flows from operating activities										(3.4)	(3.5)	(3.5)
Cash flows from investing activities:
Capital investments										0	0	0
Investments in Magnetation joint venture										0	0	0
Investments in acquired business, net of cash acquired										0
Other investing items, net										0	0	0
Net cash flows from investing activities										0	0	0
Cash flows from financing activities:
Net borrowings (repayments) under credit facility										0	0	0
Proceeds from issuance of long-term debt										0	0	0
Redemption of long-term debt										0	0	0
Proceeds from issuance of common stock										345.3		96.4
Debt issuance costs										0	0	0
Common stock dividends paid												(11.0)
Inter-company activity										(341.0)	4.1	(80.2)
SunCoke Middletown distributions to noncontrolling interest owners										0	0	0
Other financing items, net										(0.9)	(0.6)	(1.7)
Net cash flows from financing activities										3.4	3.5	3.5
Net increase (decrease) in cash and cash equivalents										0	0	0
Cash and cash equivalents, beginning of year					0				0	0	0			0
Cash and cash equivalents, end of year		0				0				0	0	0		0
Subsidiary Issuer [Member]
Condensed Statements of Operations [Abstract]
Net sales										6,284.2	5,339.3	5,676.6
Cost of products sold (exclusive of items shown separately below)										5,937.6	5,012.1	5,416.8
Selling and administrative expenses (exclusive of items shown separately below)										251.0	205.0	212.9
Depreciation										176.1	169.4	172.8
Pension and OPEB expense (income) (exclusive of corridor charges shown below)										(92.5)	(68.6)	(35.3)
Pension corridor charge										2.0		157.3
Total operating costs										6,274.2	5,317.9	5,924.5
Operating profit (loss)										10.0	21.4	(247.9)
Interest expense										142.1	125.9	85.9
Other income (expense)										(17.7)	(5.9)	(9.6)
Income (loss) before income taxes										(149.8)	(110.4)	(343.4)
Income tax expense (benefit)										(19.2)	(27.8)	735.9
Equity in net income (loss) of subsidiaries										38.3	40.2	56.4
Net income (loss)										(92.3)	(42.4)	(1,022.9)
Less: Net income attributable to noncontrolling interests										0	0	0
Net income (loss) attributable to AK Steel Holding Corporation										(92.3)	(42.4)	(1,022.9)
Other comprehensive income (loss)										(527.8)	322.3	(1.6)
Comprehensive income (loss) attributable to AK Steel Holding Corporation										(620.1)	279.9	(1,024.5)
Current assets:
Cash and cash equivalents		28.5				16.8				28.5	16.8	203.6		19.9
Accounts receivable, net		606.2				492.4				606.2	492.4
Inventory, net		1,080.5				520.0				1,080.5	520.0
Deferred tax assets, current		67.5				69.4				67.5	69.4
Other current assets		67.9				43.9				67.9	43.9
Total current assets		1,850.6				1,142.5				1,850.6	1,142.5
Property, plant and equipment		5,695.8				5,258.4				5,695.8	5,258.4
Accumulated depreciation		(4,040.8)				(3,881.7)				(4,040.8)	(3,881.7)
Property, plant and equipment, net		1,655.0				1,376.7				1,655.0	1,376.7
Other non-current assets:
Investments in affiliates		84.5				0				84.5	0
Investment in subsidiaries		1,582.4				1,393.8				1,582.4	1,393.8
Inter-company accounts		(3,420.4)				(3,479.7)				(3,420.4)	(3,479.7)
Other non-current assets		137.4				141.0				137.4	141.0
TOTAL ASSETS		1,889.5				574.3				1,889.5	574.3
Current liabilities:
Accounts payable		754.9				550.5				754.9	550.5
Accrued liabilities		244.6				133.6				244.6	133.6
Current portion of long-term debt						0.8					0.8
Current portion of pension and other postretirement benefit obligations		55.3				85.4				55.3	85.4
Total current liabilities		1,054.8				770.3				1,054.8	770.3
Non-current liabilities:
Long-term debt		2,452.5				1,506.2				2,452.5	1,506.2
Pension and other postretirement benefit obligations		1,221.3				960.6				1,221.3	960.6
Other non-current liabilities		131.8				109.6				131.8	109.6
TOTAL LIABILITIES		4,860.4				3,346.7				4,860.4	3,346.7
Equity (deficit):
Total stockholders' equity (deficit)		(2,970.9)				(2,772.4)				(2,970.9)	(2,772.4)
Noncontrolling interests		0				0				0	0
TOTAL EQUITY (DEFICIT)		(2,970.9)				(2,772.4)				(2,970.9)	(2,772.4)
TOTAL LIABILITIES AND EQUITY (DEFICIT)		1,889.5				574.3				1,889.5	574.3
Condensed Cash Flows [Abstract]
Net cash flows from operating activities										(447.2)	(251.1)	(360.0)
Cash flows from investing activities:
Capital investments										(63.1)	(39.2)	(38.3)
Investments in Magnetation joint venture										0	0	0
Investments in acquired business, net of cash acquired										(690.3)
Other investing items, net										13.6	8.5	6.7
Net cash flows from investing activities										(739.8)	(30.7)	(31.6)
Cash flows from financing activities:
Net borrowings (repayments) under credit facility										515.0	90.0	(250.0)
Proceeds from issuance of long-term debt										427.1	31.9	873.3
Redemption of long-term debt										(0.8)	(27.4)	(74.0)
Proceeds from issuance of common stock										0		0
Debt issuance costs										(15.5)	(3.4)	(22.3)
Common stock dividends paid												0
Inter-company activity										272.9	3.9	48.8
SunCoke Middletown distributions to noncontrolling interest owners										0	0	0
Other financing items, net										0	0	(0.5)
Net cash flows from financing activities										1,198.7	95.0	575.3
Net increase (decrease) in cash and cash equivalents										11.7	(186.8)	183.7
Cash and cash equivalents, beginning of year					16.8				203.6	16.8	203.6			19.9
Cash and cash equivalents, end of year		28.5				16.8				28.5	16.8	203.6		19.9
AK Steel [Member]
Condensed Statements of Operations [Abstract]
Net sales										280.7	261.5	287.4
Cost of products sold (exclusive of items shown separately below)										199.3	189.0	204.5
Selling and administrative expenses (exclusive of items shown separately below)										11.3	10.5	9.9
Depreciation										3.9	4.3	4.7
Pension and OPEB expense (income) (exclusive of corridor charges shown below)										0	0	0
Pension corridor charge										0		0
Total operating costs										214.5	203.8	219.1
Operating profit (loss)										66.2	57.7	68.3
Interest expense										0	0	0
Other income (expense)										6.5	6.1	7.0
Income (loss) before income taxes										72.7	63.8	75.3
Income tax expense (benefit)										29.1	20.1	30.1
Equity in net income (loss) of subsidiaries										0	0	0
Net income (loss)										43.6	43.7	45.2
Less: Net income attributable to noncontrolling interests										0	0	0
Net income (loss) attributable to AK Steel Holding Corporation										43.6	43.7	45.2
Other comprehensive income (loss)										0	0	0
Comprehensive income (loss) attributable to AK Steel Holding Corporation										43.6	43.7	45.2
Current assets:
Cash and cash equivalents		0.5				0				0.5	0	0		0
Accounts receivable, net		27.6				25.2				27.6	25.2
Inventory, net		26.2				19.2				26.2	19.2
Deferred tax assets, current		0				0				0	0
Other current assets		0.2				0.2				0.2	0.2
Total current assets		54.5				44.6				54.5	44.6
Property, plant and equipment		97.3				94.9				97.3	94.9
Accumulated depreciation		(71.8)				(67.9)				(71.8)	(67.9)
Property, plant and equipment, net		25.5				27.0				25.5	27.0
Other non-current assets:
Investments in affiliates		0				0				0	0
Investment in subsidiaries		0				0				0	0
Inter-company accounts		1,325.5				1,269.6				1,325.5	1,269.6
Other non-current assets		33.0				33.0				33.0	33.0
TOTAL ASSETS		1,438.5				1,374.2				1,438.5	1,374.2
Current liabilities:
Accounts payable		6.9				6.3				6.9	6.3
Accrued liabilities		3.0				2.9				3.0	2.9
Current portion of long-term debt						0					0
Current portion of pension and other postretirement benefit obligations		0				0				0	0
Total current liabilities		9.9				9.2				9.9	9.2
Non-current liabilities:
Long-term debt		0				0				0	0
Pension and other postretirement benefit obligations		0				0				0	0
Other non-current liabilities		0				0				0	0
TOTAL LIABILITIES		9.9				9.2				9.9	9.2
Equity (deficit):
Total stockholders' equity (deficit)		1,428.6				1,365.0				1,428.6	1,365.0
Noncontrolling interests		0				0				0	0
TOTAL EQUITY (DEFICIT)		1,428.6				1,365.0				1,428.6	1,365.0
TOTAL LIABILITIES AND EQUITY (DEFICIT)		1,438.5				1,374.2				1,438.5	1,374.2
Condensed Cash Flows [Abstract]
Net cash flows from operating activities										39.2	50.4	57.3
Cash flows from investing activities:
Capital investments										(2.8)	(1.7)	(1.7)
Investments in Magnetation joint venture											0	0
Investments in acquired business, net of cash acquired										0
Other investing items, net										0	0.3	0.2
Net cash flows from investing activities										(2.8)	(1.4)	(1.5)
Cash flows from financing activities:
Net borrowings (repayments) under credit facility										0	0	0
Proceeds from issuance of long-term debt										0	0	0
Redemption of long-term debt										0	0	0
Proceeds from issuance of common stock												0
Debt issuance costs										0	0	0
Common stock dividends paid												0
Inter-company activity										(35.9)	(49.0)	(55.8)
SunCoke Middletown distributions to noncontrolling interest owners										0	0	0
Other financing items, net										0	0	0
Net cash flows from financing activities										(35.9)	(49.0)	(55.8)
Net increase (decrease) in cash and cash equivalents										0.5	0	0
Cash and cash equivalents, beginning of year					0				0	0	0			0
Cash and cash equivalents, end of year		0.5				0				0.5	0	0		0
Other Non-Guarantor Subsidiaries [Member]
Condensed Statements of Operations [Abstract]
Net sales										599.6	568.8	618.9
Cost of products sold (exclusive of items shown separately below)										484.7	463.3	533.5
Selling and administrative expenses (exclusive of items shown separately below)										28.3	26.2	25.4
Depreciation										21.9	16.4	14.5
Pension and OPEB expense (income) (exclusive of corridor charges shown below)										0	0	0
Pension corridor charge										0		0
Total operating costs										534.9	505.9	573.4
Operating profit (loss)										64.7	62.9	45.5
Interest expense										2.6	1.5	0.8
Other income (expense)										(9.9)	(1.6)	8.8
Income (loss) before income taxes										52.2	59.8	53.5
Income tax expense (benefit)										(3.4)	(2.0)	19.8
Equity in net income (loss) of subsidiaries										0	0	0
Net income (loss)										55.6	61.8	33.7
Less: Net income attributable to noncontrolling interests										62.8	64.2	28.7
Net income (loss) attributable to AK Steel Holding Corporation										(7.2)	(2.4)	5.0
Other comprehensive income (loss)										(3.7)	1.2	0.7
Comprehensive income (loss) attributable to AK Steel Holding Corporation										(10.9)	(1.2)	5.7
Current assets:
Cash and cash equivalents		41.2				28.5				41.2	28.5	23.4		22.1
Accounts receivable, net		37.3				35.9				37.3	35.9
Inventory, net		73.5				58.5				73.5	58.5
Deferred tax assets, current		0.2				0.2				0.2	0.2
Other current assets		3.0				2.1				3.0	2.1
Total current assets		155.2				125.2				155.2	125.2
Property, plant and equipment		595.3				518.6				595.3	518.6
Accumulated depreciation		(62.6)				(42.2)				(62.6)	(42.2)
Property, plant and equipment, net		532.7				476.4				532.7	476.4
Other non-current assets:
Investments in affiliates		304.2				214.1				304.2	214.1
Investment in subsidiaries		0				0				0	0
Inter-company accounts		(412.4)				(372.9)				(412.4)	(372.9)
Other non-current assets		60.5				64.3				60.5	64.3
TOTAL ASSETS		640.2				507.1				640.2	507.1
Current liabilities:
Accounts payable		42.0				45.6				42.0	45.6
Accrued liabilities		18.9				6.4				18.9	6.4
Current portion of long-term debt						0					0
Current portion of pension and other postretirement benefit obligations		0.3				0.5				0.3	0.5
Total current liabilities		61.2				52.5				61.2	52.5
Non-current liabilities:
Long-term debt		0				0				0	0
Pension and other postretirement benefit obligations		4.0				4.8				4.0	4.8
Other non-current liabilities		0.7				0.4				0.7	0.4
TOTAL LIABILITIES		65.9				57.7				65.9	57.7
Equity (deficit):
Total stockholders' equity (deficit)		158.8				35.7				158.8	35.7
Noncontrolling interests		415.5				413.7				415.5	413.7
TOTAL EQUITY (DEFICIT)		574.3				449.4				574.3	449.4
TOTAL LIABILITIES AND EQUITY (DEFICIT)		640.2				507.1				640.2	507.1
Condensed Cash Flows [Abstract]
Net cash flows from operating activities										91.3	129.6	55.8
Cash flows from investing activities:
Capital investments										(15.2)	(22.7)	(24.1)
Investments in Magnetation joint venture										(100.0)	(50.0)	(60.6)
Investments in acquired business, net of cash acquired										0
Other investing items, net										0	6.3	(0.8)
Net cash flows from investing activities										(115.2)	(66.4)	(85.5)
Cash flows from financing activities:
Net borrowings (repayments) under credit facility										0	0	0
Proceeds from issuance of long-term debt										0	0	0
Redemption of long-term debt										0	0	0
Proceeds from issuance of common stock										0		0
Debt issuance costs										0	0	0
Common stock dividends paid												0
Inter-company activity										101.3	5.4	66.8
SunCoke Middletown distributions to noncontrolling interest owners										(61.0)	(64.8)	(36.6)
Other financing items, net										(3.7)	1.3	0.8
Net cash flows from financing activities										36.6	(58.1)	31.0
Net increase (decrease) in cash and cash equivalents										12.7	5.1	1.3
Cash and cash equivalents, beginning of year					28.5				23.4	28.5	23.4			22.1
Cash and cash equivalents, end of year		41.2				28.5				41.2	28.5	23.4		22.1
Eliminations [Member]
Condensed Statements of Operations [Abstract]
Net sales										(658.8)	(599.2)	(649.2)
Cost of products sold (exclusive of items shown separately below)										(613.9)	(556.6)	(615.7)
Selling and administrative expenses (exclusive of items shown separately below)										(48.0)	(40.8)	(43.9)
Depreciation										0	0	0
Pension and OPEB expense (income) (exclusive of corridor charges shown below)										0	0	0
Pension corridor charge										0		0
Total operating costs										(661.9)	(597.4)	(659.6)
Operating profit (loss)										3.1	(1.8)	10.4
Interest expense										0	0	0
Other income (expense)										0	0	0
Income (loss) before income taxes										3.1	(1.8)	10.4
Income tax expense (benefit)										1.2	(0.7)	4.2
Equity in net income (loss) of subsidiaries										54.0	2.2	966.5
Net income (loss)										55.9	1.1	972.7
Less: Net income attributable to noncontrolling interests										0	0	0
Net income (loss) attributable to AK Steel Holding Corporation										55.9	1.1	972.7
Other comprehensive income (loss)										531.5	(323.5)	0.9
Comprehensive income (loss) attributable to AK Steel Holding Corporation										587.4	(322.4)	973.6
Current assets:
Cash and cash equivalents		0				0				0	0	0		0
Accounts receivable, net		(26.8)				(28.3)				(26.8)	(28.3)
Inventory, net		(8.1)				(11.1)				(8.1)	(11.1)
Deferred tax assets, current		0				0				0	0
Other current assets		0				0				0	0
Total current assets		(34.9)				(39.4)				(34.9)	(39.4)
Property, plant and equipment		0				0				0	0
Accumulated depreciation		0				0				0	0
Property, plant and equipment, net		0				0				0	0
Other non-current assets:
Investments in affiliates		0				0				0	0
Investment in subsidiaries		1,388.5				1,378.6				1,388.5	1,378.6
Inter-company accounts		29.2				31.9				29.2	31.9
Other non-current assets		0				0				0	0
TOTAL ASSETS		1,382.8				1,371.1				1,382.8	1,371.1
Current liabilities:
Accounts payable		(0.7)				(0.6)				(0.7)	(0.6)
Accrued liabilities		0				0				0	0
Current portion of long-term debt						0					0
Current portion of pension and other postretirement benefit obligations		0				0				0	0
Total current liabilities		(0.7)				(0.6)				(0.7)	(0.6)
Non-current liabilities:
Long-term debt		0				0				0	0
Pension and other postretirement benefit obligations		0				0				0	0
Other non-current liabilities		0				0				0	0
TOTAL LIABILITIES		(0.7)				(0.6)				(0.7)	(0.6)
Equity (deficit):
Total stockholders' equity (deficit)		1,383.5				1,371.7				1,383.5	1,371.7
Noncontrolling interests		0				0				0	0
TOTAL EQUITY (DEFICIT)		1,383.5				1,371.7				1,383.5	1,371.7
TOTAL LIABILITIES AND EQUITY (DEFICIT)		1,382.8				1,371.1				1,382.8	1,371.1
Condensed Cash Flows [Abstract]
Net cash flows from operating activities										(2.7)	(35.6)	(20.4)
Cash flows from investing activities:
Capital investments										0	0	0
Investments in Magnetation joint venture										0	0	0
Investments in acquired business, net of cash acquired										0
Other investing items, net										0	0	0
Net cash flows from investing activities										0	0	0
Cash flows from financing activities:
Net borrowings (repayments) under credit facility										0	0	0
Proceeds from issuance of long-term debt										0	0	0
Redemption of long-term debt										0	0	0
Proceeds from issuance of common stock										0		0
Debt issuance costs										0	0	0
Common stock dividends paid												0
Inter-company activity										2.7	35.6	20.4
SunCoke Middletown distributions to noncontrolling interest owners										0	0	0
Other financing items, net										0	0	0
Net cash flows from financing activities										2.7	35.6	20.4
Net increase (decrease) in cash and cash equivalents										0	0	0
Cash and cash equivalents, beginning of year					0				0	0	0			0
Cash and cash equivalents, end of year		$ 0				$ 0				$ 0	$ 0	$ 0		$ 0
Senior Secured Notes Due December 2018 [Member]
Condensed Financial Statements, Captions [Line Items]
Debt Instrument, Interest Rate, Stated Percentage (in hundredths)		8.75%				8.75%				8.75%	8.75%
Senior Notes Due May 2020 [Member]
Condensed Financial Statements, Captions [Line Items]
Debt Instrument, Interest Rate, Stated Percentage (in hundredths)		7.625%				7.625%				7.625%	7.625%
Senior Notes Due October 2021 [Member]
Condensed Financial Statements, Captions [Line Items]
Debt Instrument, Interest Rate, Stated Percentage (in hundredths)		7.625%								7.625%
Senior Notes Due April 2022 [Member]
Condensed Financial Statements, Captions [Line Items]
Debt Instrument, Interest Rate, Stated Percentage (in hundredths)		8.375%				8.375%				8.375%	8.375%
Exchangeable Senior Notes Due November 2019 [Member]
Condensed Financial Statements, Captions [Line Items]
Debt Instrument, Interest Rate, Stated Percentage (in hundredths)		5.00%				5.00%				5.00%	5.00%