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Partnership Initial Public Offering and Dropdown Transactions (Tables)
 12 Months Ended
Dec. 31, 2015
Business Combinations [Abstract]  
Changes in Company's Ownership Interest in Les than Wholly Owned Subsidiary
The table below summarizes the effects of the changes in the Company’s ownership interest in Haverhill, Middletown and Granite City on SunCoke’s equity.
 
Years Ended December 31,
 
2015
 
2014
 
(Dollars in millions)
Net loss attributable to SunCoke Energy, Inc.
$
(22.0
)
 
$
(126.1
)
Decrease in SunCoke Energy, Inc. equity for the contribution of 75 percent interest in Granite City
(6.5
)
 
—

Decrease in SunCoke Energy, Inc. for the contribution of an additional 23 percent interest in Granite City
(1.5
)
 
—

Increase in SunCoke Energy, Inc. equity for the contribution of 33 percent interest in Haverhill and Middletown
—

 
83.7

Change from net loss attributable to SunCoke Energy, Inc. and dropdown transactions
$
(30.0
)
 
$
(42.4
)