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Derivative Instruments and Hedging Activities (Tables) | 9 Months Ended
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Sep. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] | Balance Sheet Presentation Related to Derivative Instruments The Company had no material derivative instruments included in its Condensed Consolidated Balance Sheet at September 30, 2013. The fair value of the derivative instruments that are presented in the Company's Condensed Consolidated Balance Sheet at December 31, 2012 are as follows:
|  | Fair Value
Instrument | Balance Sheet Location | Assets | Liabilities
|  | (In millions)
Derivatives Designated as Hedging Instruments |  |  |
Natural Gas |  |  |
Financial Futures/Swaps | Other Current Assets | $ | — |  | $ | 0.5 |
Total | $ | — |  | $ | 0.5 |
Derivatives Not Designated as Hedging Instruments |  |  |
Natural Gas |  |  |
Financial Futures/Swaps | Current PRM | $ | 0.1 |  | $ | — |
| Other Current Assets | 5.0 |  | 4.7 |
Physical Purchases/Sales | Current PRM | 0.4 |  | 0.3 |
Total | $ | 5.5 |  | $ | 5.0 |
Total Gross Derivatives (A) | $ | 5.5 |  | $ | 5.5 |
(A) | See Note 4 for a reconciliation of the Company's total derivatives fair value to the Company's Condensed Consolidated Balance Sheet at December 31, 2012.
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Table Text Block] | Income Statement Presentation Related to Derivative Instruments The following tables present the effect of derivative instruments on the Company's Condensed Consolidated Statement of Income for the three months ended September 30, 2012. Derivatives in Cash Flow Hedging Relationships
(In millions) | Amount Recognized in Other Comprehensive Income | Amount Reclassified from Accumulated Other Comprehensive Income (Loss) into Income | Amount Recognized in Income
Natural Gas Financial Futures/Swaps | $ | (0.8 | ) | $ | — |  | $ | — |
Interest Rate Swap | — |  | (0.1 | ) | — |
Total | $ | (0.8 | ) | $ | (0.1 | ) | $ | — |
Derivatives Not Designated as Hedging Instruments
(In millions) | Amount Recognized in Income
Natural Gas Physical Purchases/Sales | $ | (2.7 | )
Natural Gas Financial Futures/Swaps | (0.2 | )
Total | $ | (2.9 | )
The following tables present the effect of derivative instruments on the Company's Condensed Consolidated Statement of Income for the nine months ended September 30, 2012. Derivatives in Cash Flow Hedging Relationships
(In millions) | Amount Recognized in Other Comprehensive Income | Amount Reclassified from Accumulated Other Comprehensive Income (Loss) into Income | Amount Recognized in Income
Natural Gas Financial Futures/Swaps | $ | (1.0 | ) | $ | 5.2 |  | $ | — |
Interest Rate Swap | — |  | (0.3 | ) | — |
Total | $ | (1.0 | ) | $ | 4.9 |  | $ | — |
Derivatives Not Designated as Hedging Instruments
(In millions) | Amount Recognized in Income
Natural Gas Physical Purchases/Sales | $ | (8.8 | )
Natural Gas Financial Futures/Swaps | 0.8 |
Total | $ | (8.0 | )

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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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