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Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE OF FINANCIAL INSTRUMENTS (Narrative) (Details)

v2.4.0.8
FAIR VALUE OF FINANCIAL INSTRUMENTS (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Dec. 31, 2002
Fair Value, Assets And Liabilities Components [Line Items] Ìý Ìý Ìý
Management Estimate of 62% Fe 62.00% Ìý Ìý
Supply agreement, customer receivable, basis spread on variable rate 3.50% Ìý Ìý
Empire [Member]
Ìý Ìý Ìý
Fair Value, Assets And Liabilities Components [Line Items] Ìý Ìý Ìý
Loans Receivable, Fair Value Disclosure $ 14.3 $ 21.3 Ìý
Estimated credit-adjusted risk-free interest rate 1.98% 2.85% Ìý
Accounts, Notes, Loans and Financing Receivable, Net, Noncurrent 13.4 19.3 120.0
Prior [Member] | Empire [Member]
Ìý Ìý Ìý
Fair Value, Assets And Liabilities Components [Line Items] Ìý Ìý Ìý
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners Ìý Ìý 46.70%
Current [Member] | Empire [Member]
Ìý Ìý Ìý
Fair Value, Assets And Liabilities Components [Line Items] Ìý Ìý Ìý
Percent ownership interest after transaction Ìý Ìý 79.00%
Other Current Assets [Member] | Empire [Member]
Ìý Ìý Ìý
Fair Value, Assets And Liabilities Components [Line Items] Ìý Ìý Ìý
Other current assets 10.0 10.0 Ìý
Customer Supplemental Payments [Member]
Ìý Ìý Ìý
Fair Value, Assets And Liabilities Components [Line Items] Ìý Ìý Ìý
Maximum deferred portion of supplemental payments 22.3 Ìý Ìý
Supply agreement, customer receivable, stated interest rate 9.00% Ìý Ìý
Supply agreement, customer receivable, description of variable rate basis prime rate Ìý Ìý
Payments for (Proceeds from) Loans Receivable 22.3 Ìý Ìý
Loans Receivable, Fair Value Disclosure Ìý 21.3 Ìý
Estimated credit-adjusted risk-free interest rate Ìý 2.81% Ìý
Customer Supplemental Payments [Member] | Other Current Assets [Member]
Ìý Ìý Ìý
Fair Value, Assets And Liabilities Components [Line Items] Ìý Ìý Ìý
Other current assets Ìý 22.3 Ìý
Amapa [Member]
Ìý Ìý Ìý
Fair Value, Assets And Liabilities Components [Line Items] Ìý Ìý Ìý
Equity Method Investments, Fair Value Disclosure 0 72.5 Ìý
Equity Method Investment, Other than Temporary Impairment $ 67.6 $ 365.4 Ìý