CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities:
Net income (loss)	$ (777.0)	$ 34.8
Depreciation	144.9	139.3
Amortization	12.8	11.7
Deferred income taxes	753.4	28.2
Pension and OPEB expense (income)	(28.0)	(26.7)
Contributions to pension trust	(170.2)	(170.0)
Other postretirement benefit payments	(48.3)	(56.7)
Other operating items, net	3.1	(14.8)
Net cash flows from operating activities	(387.9)	(355.4)
Cash flows from investing activities:
Capital investments	(49.3)	(251.2)
Investments in acquired businesses	(38.1)	0
Other investing items, net	4.6	0.7
Net cash flows from investing activities	(82.8)	(250.5)
Cash flows from financing activities:
Net borrowings under credit facility	192.0	295.0
Proceeds from issuance of long-term debt	373.3	0
Redemption of long-term debt	(73.9)	(0.5)
Debt issuance costs	(8.6)	(9.2)
Proceeds from exercise of stock options	0	0.2
Purchase of treasury stock	(1.7)	(1.4)
Common stock dividends paid	(11.0)	(16.5)
SunCoke Middletown advances from noncontrolling interest owner	5.5	180.3
Other financing items, net	0.2	(0.1)
Net cash flows from financing activities	475.8	447.8
Net increase (decrease) in cash and cash equivalents	5.1	(158.1)
Cash and cash equivalents, beginning of period	42.0	216.8
Cash and cash equivalents, end of period	47.1	58.7
Middletown and Butler Retirees [Member]
Cash flows from operating activities:
Contributions to retirees VEBA	(31.7)	(87.6)
Consolidated Entity Excluding Variable Interest Entities (VIE) [Member]
Cash flows from operating activities:
Depreciation	134.7	139.3
Working capital	(217.1)	(202.5)
Cash flows from investing activities:
Capital investments	(31.8)	(88.0)
SunCoke Middletown [Member]
Cash flows from operating activities:
Depreciation	10.2	0
Working capital	(29.8)	(11.1)
Net cash flows from operating activities	12.0	(17.1)
Cash flows from investing activities:
Capital investments	(17.5)	(163.2)
Cash flows from financing activities:
SunCoke Middletown advances from noncontrolling interest owner	$ 5.5	$ 180.3