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Acquisition of Dearborn (Details2) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Sep. 16, 2014
Jul. 31, 2015
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]            
Payments to Acquire Businesses, Net of Cash Acquired       $ 0.0 $ 690.3 $ 0.0
Stock Issued During Period, Shares, New Issues 40,250,000          
Shares Issued, Price Per Share $ 9.00          
Proceeds from Sale of Equity Method Investments       $ 25.0 0.0 $ 0.0
Severstal Dearborn [Member]            
Business Acquisition [Line Items]            
Payments to Acquire Businesses, Net of Cash Acquired         690.3  
Business Combination, Additional Disclosures, Income Tax Charge         8.4  
Other Income (Expense) [Member] | Severstal Dearborn [Member]            
Business Acquisition [Line Items]            
Business Combination, Additional Disclosures, Unused Bridge Commitment Expensed         12.6  
Selling, General and Administrative Expenses [Member] | Severstal Dearborn [Member]            
Business Acquisition [Line Items]            
Business Combination, Acquisition Related Costs         8.1  
Business Combination, Additional Disclosures, Severance Costs Expensed         $ 2.6  
Senior Notes Due October 2021 [Member]            
Business Acquisition [Line Items]            
Debt Instrument, Face Amount $ 430.0          
Debt Instrument, Interest Rate, Stated Percentage (in hundredths) 7.625%     7.625% 7.625%  
Debt Instrument, Maturity Date Oct. 01, 2021     Oct. 01, 2021    
Debt Instrument Offering Price 99.325%          
Double Eagle Steel Coating Company [Member]            
Business Acquisition [Line Items]            
Equity method investment, ownership percentage (in hundredths)     50.00%      
Proceeds from Sale of Equity Method Investments     $ 25.0      
DTE Electric Company [Member]            
Business Acquisition [Line Items]            
Loss Contingency, Damages Awarded, Value   $ 25.0