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Acquisition of Dearborn (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Sep. 16, 2014
Jul. 31, 2015
Jun. 30, 2015
Jun. 30, 2015
Jun. 30, 2014
Business Acquisition [Line Items]          
Proceeds from sale of equity investee       $ 25.0 $ 0.0
Severstal Dearborn [Member]          
Business Acquisition [Line Items]          
Payments to Acquire Businesses, Net of Cash Acquired $ 690.3        
Accounts receivable 181.1        
Inventory 362.6        
Other current assets 3.6        
Property, plant and equipment 444.5        
Investment in affilates 72.5        
Total assets acquired 1,064.3        
Accounts payable (201.4)        
Accrued liabilities (32.8)        
Other postretirement benefit obligations (128.2)        
Other non-current liabilities (11.6)        
Total liabilities assumed (374.0)        
Purchase price, net of cash acquired $ 690.3        
Business Acquisition, Pro Forma Revenue         3,926.6
Business Acquisition, Pro Forma Operating Profit (Loss)         (974.5)
Business Combination Pro Forma Asset Impairment Charge         $ 1,005.1
Double Eagle Steel Coating Company [Member]          
Business Acquisition [Line Items]          
Equity Method Investment, Ownership Percentage     50.00% 50.00%  
Proceeds from sale of equity investee     $ 25.0    
Subsequent Event [Member]          
Business Acquisition [Line Items]          
Loss Contingency, Damages Awarded, Value   $ 25.0