Business Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended									12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012		Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Business Segment Information
Sales and other operating revenue	$ 388.5	$ 389.9	$ 403.6	$ 451.5	$ 480.6	[1]	$ 480.1	$ 460.7	$ 480.6	$ 1,633.5	$ 1,902.0	$ 1,527.6
Intersegment sales										0	0	0
Adjusted EBITDA										215.1	265.7	138.8
Loss from equity method investment										2.2	0	0
Depreciation, depletion and amortization										96.0	80.8	58.4
Capital expenditures										145.6	80.6	238.1	[2]
Total segment assets										2,243.9	2,011.0	1,941.8
Domestic Coke
Business Segment Information
Sales and other operating revenue										1,528.7	1,816.8	1,445.1
Intersegment sales										0	0	0
Adjusted EBITDA										243.2	249.4	133.8
Loss from equity method investment										0
Depreciation, depletion and amortization										68.1	60.7	43.6
Capital expenditures										121.2	42.3	198.2	[2]
Total segment assets										1,528.4	1,496.3	1,522.4
Brazil Coke
Business Segment Information
Sales and other operating revenue										35.4	36.9	38.0
Intersegment sales										0	0	0
Adjusted EBITDA										16.1	11.9	13.7
Loss from equity method investment										0
Depreciation, depletion and amortization										0.4	0.3	0.2
Capital expenditures										0.8	1.5	0.6	[2]
Total segment assets										59.6	60.6	62.7
India Coke
Business Segment Information
Sales and other operating revenue										0
Intersegment sales										0
Adjusted EBITDA										0.9
Loss from equity method investment										2.2
Depreciation, depletion and amortization										0
Capital expenditures										0
Total segment assets										57.0
Coal Mining
Business Segment Information
Sales and other operating revenue										61.3	48.3	44.5
Intersegment sales										136.7	203.4	183.6
Adjusted EBITDA										(18.7)	33.4	35.5
Loss from equity method investment										0
Depreciation, depletion and amortization										23.2	17.6	12.9
Capital expenditures										20.1	34.3	30.7	[2]
Total segment assets										182.7	196.9	182.1
Coal Logistics
Business Segment Information
Sales and other operating revenue										8.1
Intersegment sales										5.5
Adjusted EBITDA										4.7
Loss from equity method investment										0
Depreciation, depletion and amortization										1.8
Capital expenditures										0.2
Total segment assets										119.0
Corporate and Other
Business Segment Information
Sales and other operating revenue										0	0	0
Intersegment sales										0	0	0
Adjusted EBITDA										(31.1)	(29.0)	(44.2)
Loss from equity method investment										0
Depreciation, depletion and amortization										2.5	2.2	1.7
Capital expenditures										3.3	2.5	8.6	[2]
Total segment assets										$ 297.2	$ 257.2	$ 174.6

[1] In the fourth quarter of 2011, we recorded approximately a $7.0 million reduction to revenue related to the resolution of certain contract and billing issues with our customer at our Indiana Harbor facility. The resolution of this matter favorably impacted revenues by approximately $4.2 million in the fourth quarter of 2012.

[2] Domestic Coke capital expenditures includes $169.4 million attributable to the Middletown facility.