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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
Mar. 31, 2016
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%   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