CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Cash flows from operating activities:
Net income (loss)	$ 34.8	$ (32.2)
Depreciation	139.3	150.5
Amortization	11.7	14.1
Deferred income taxes	28.2	25.5
Contributions to pension trust	(170.0)	(110.0)
Pension and other postretirement benefit payments greater than expense	(85.5)	(78.3)
Other operating items, net	(12.7)	18.7
Net cash flows from operating activities	(355.4)	(176.5)
Cash flows from investing activities:
Capital investments	(251.2)	(158.7)
Other investing items, net	0.7	0.8
Net cash flows from investing activities	(250.5)	(157.9)
Cash flows from financing activities:
Net borrowings under credit facility	295.0	0
Proceeds from issuance of long-term debt	0	400.0
Redemption of long-term debt	(0.5)	(506.1)
Debt issuance costs	(9.2)	(9.0)
Proceeds from exercise of stock options	0.2	1.3
Purchase of treasury stock	(1.4)	(7.7)
Common stock dividends paid	(16.5)	(16.5)
Advances from noncontrolling interest owner to SunCoke Middletown	180.3	88.4
Other financing items, net	(0.1)	2.8
Net cash flows from financing activities	447.8	(46.8)
Net decrease in cash and cash equivalents	(158.1)	(381.2)
Cash and cash equivalents, beginning of period	216.8	461.7
Cash and cash equivalents, end of period	58.7	80.5
Other Controlled Companies [Member]
Cash flows from operating activities:
Working capital	(202.5)	(100.1)
Cash flows from investing activities:
Capital investments	(88.0)	(72.3)
SunCoke Middletown [Member]
Cash flows from operating activities:
Working capital	(11.1)	0.3
Cash flows from investing activities:
Capital investments	(163.2)	(86.4)
Middletown and Butler Retirees [Member]
Cash flows from operating activities:
Contributions to Middletown and Butler retirees VEBAs	$ (87.6)	$ (65.0)