Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE OF FINANCIAL INSTRUMENTS (Carrying Value And Fair Value Of Financial Instruments Disclosure) (Details)

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FAIR VALUE OF FINANCIAL INSTRUMENTS (Carrying Value And Fair Value Of Financial Instruments Disclosure) (Details) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Face Amount $ 4,712,100,000 $ 5,497,100,000
Long-term debt:    
Term loan, carrying value 3,327,500,000 4,054,800,000
Total long-term debt, carrying value 3,319,600,000 3,960,700,000
Term Loan - $1.25 Billion [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Face Amount   847,100,000
Term Loan Original Amount 0 1,250,000,000
Long-term debt:    
Term loan, carrying value   847,100,000 [1]
Seven Hundred Million Four Point Eight Seven Five Two Thousand Twenty-one Senior Note [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Face Amount 700,000,000 700,000,000
Long-term debt:    
Term loan, carrying value 699,400,000 [2] 699,400,000 [2]
Senior Notes - $1.3 Billion [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Face Amount 1,300,000,000.0 1,300,000,000.0
Senior Notes - $400 Million [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Face Amount 400,000,000 400,000,000
Long-term debt:    
Term loan, carrying value 398,400,000 [3] 398,200,000 [3]
Senior Notes - $500 Million [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Face Amount 500,000,000.0 500,000,000.0
Long-term debt:    
Term loan, carrying value 496,300,000 [4] 495,700,000 [4]
Revolving Credit Facility [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Face Amount 1,750,000,000.00 1,750,000,000.00
Long-term debt:    
Revolving loan, carrying value 380,000,000 [5] 325,000,000 [5]
Equipment Loans [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Face Amount 62,100,000  
Long-term debt:    
Term loan, carrying value 62,100,000  
Interest Rate Swap [Member]
    
Long-term debt:    
Fair Value Adjustment to Interest Rate Hedge 1,700,000  
Portion at Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Accounts Receivable, Fair Value Disclosure 24,400,000 53,500,000
Long-term debt:    
Total long-term debt, fair value 3,565,400,000 4,354,800,000
Portion at Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Customer Supplemental Payments [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Accounts Receivable, Fair Value Disclosure 0 21,300,000
Portion at Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | ArcelorMittal USA - Receivable [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Accounts Receivable, Fair Value Disclosure 14,300,000 21,300,000
Portion at Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Other Credit Receivable [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Accounts Receivable, Fair Value Disclosure 10,100,000 10,900,000
Portion at Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Term Loan - $1.25 Billion [Member]
    
Long-term debt:    
Debt Instrument, Fair Value Disclosure 0 753,000,000
Portion at Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Seven Hundred Million Four Point Eight Seven Five Two Thousand Twenty-one Senior Note [Member]
    
Long-term debt:    
Debt Instrument, Fair Value Disclosure 719,200,000 759,400,000
Portion at Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Senior Notes - $1.3 Billion [Member]
    
Long-term debt:    
Debt Instrument, Fair Value Disclosure 1,442,200,000 1,524,700,000
Portion at Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Senior Notes - $400 Million [Member]
    
Long-term debt:    
Debt Instrument, Fair Value Disclosure 439,700,000 464,300,000
Portion at Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Senior Notes - $500 Million [Member]
    
Long-term debt:    
Debt Instrument, Fair Value Disclosure 528,400,000 528,400,000
Portion at Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Revolving Credit Facility [Member]
    
Long-term debt:    
Revolving loan, fair value 380,000,000 325,000,000
Portion at Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Equipment Loans [Member]
    
Long-term debt:    
Debt Instrument, Fair Value Disclosure 54,200,000 0
Portion at Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
    
Long-term debt:    
Fair Value Adjustment to Interest Rate Hedge 1,700,000 0
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Accounts, Notes, Loans and Financing Receivable, Net, Noncurrent 23,500,000 52,500,000
Long-term debt:    
Total long-term debt, carrying value 3,319,600,000 3,960,700,000
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Customer Supplemental Payments [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Accounts, Notes, Loans and Financing Receivable, Net, Noncurrent 0 22,300,000
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | ArcelorMittal USA - Receivable [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Accounts, Notes, Loans and Financing Receivable, Net, Noncurrent 13,400,000 19,300,000
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Other Credit Receivable [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Accounts, Notes, Loans and Financing Receivable, Net, Noncurrent 10,100,000 10,900,000
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Term Loan - $1.25 Billion [Member]
    
Long-term debt:    
Term loan, carrying value 0 753,000,000
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Seven Hundred Million Four Point Eight Seven Five Two Thousand Twenty-one Senior Note [Member]
    
Long-term debt:    
Senior notes, carrying value 699,400,000 699,400,000
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Senior Notes - $1.3 Billion [Member]
    
Long-term debt:    
Senior notes, carrying value 1,289,600,000 1,289,400,000
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Senior Notes - $400 Million [Member]
    
Long-term debt:    
Senior notes, carrying value 398,400,000 398,200,000
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Senior Notes - $500 Million [Member]
    
Long-term debt:    
Senior notes, carrying value 496,300,000 495,700,000.0
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Revolving Credit Facility [Member]
    
Long-term debt:    
Revolving loan, carrying value 380,000,000 325,000,000
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Equipment Loans [Member]
    
Long-term debt:    
Term loan, carrying value 54,200,000 0
Reported Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
    
Long-term debt:    
Fair Value Adjustment to Interest Rate Hedge $ 1,700,000 $ 0
[1] During the first quarter of 2013, the term loan was repaid in full through repayments totaling $847.1 million. As of December 31, 2012, $402.8 million had been paid on the original $1.25 billion term loan and, of the remaining term loan, $94.1 million was classified as Current portion of debt. The current classification was based upon the principal payment terms of the arrangement requiring principal payments on each three-month anniversary following the funding of the term loan.
[2] As of September 30, 2013 and December 31, 2012, the $700 million 4.875 percent senior notes were recorded at a par value of $700 million less unamortized discounts of $0.6 million for each period, based on an imputed interest rate of 4.89 percent.
[3] As of September 30, 2013 and December 31, 2012, the $400 million 5.90 percent senior notes were recorded at a par value of $400 million less unamortized discounts of $1.6 million and $1.8 million, respectively, based on an imputed interest rate of 5.98 percent.
[4] As of September 30, 2013 and December 31, 2012, the $500 million 3.95 percent senior notes were recorded at a par value of $500 million less unamortized discounts of $3.7 million and $4.3 million, respectively, based on an imputed interest rate of 4.14 percent.
[5] As of September 30, 2013 and December 31, 2012, $380.0 million and $325.0 million revolving loans were drawn under the credit facility, respectively, and the principal amount of letter of credit obligations totaled $27.7 million for each period, thereby reducing available borrowing capacity to $1.3 billion and $1.4 billion for each period, respectively.