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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income Tax Expense [Line Items]
Income tax provision (benefit)	$ (2.8)	$ (4.3)
Valuation allowance charge	1.1
SunCoke Middletown [Member]
Income Tax Expense [Line Items]
Income tax provision (benefit)		$ 3.0

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

The amount of the change in the period in the valuation allowance for a specified deferred tax asset.