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Supplemental Cash Flow Information (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Supplemental cash flow, net cash paid (received) during the period for: [Abstract]        
Interest, net of capitalized interest $ 1.6 $ 3.2    
Income taxes paid, net 0.3 0.2    
Net Cash Provided by (Used in) Operating Activities (7.0) (150.0)    
Supplemental cash flow, noncash investing and financing activities [Abstract]        
Capital investments 6.9 4.3    
Cash and Cash Equivalents, at Carrying Value 191.8 42.3 227.0 42.0
Restricted Stock and Restricted Stock Units [Member]
       
Supplemental cash flow, noncash investing and financing activities [Abstract]        
Issuance of restricted stock and restricted stock units 2.3 4.5    
Variable Interest Entity, Primary Beneficiary [Member] | SunCoke Middletown [Member]
       
Supplemental cash flow, net cash paid (received) during the period for: [Abstract]        
Net Cash Provided by (Used in) Operating Activities 23.7 19.2    
Supplemental cash flow, noncash investing and financing activities [Abstract]        
Cash and Cash Equivalents, at Carrying Value $ 13.6   $ 0