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Derivative Instruments and Hedging Activities (Tables) | 12 Months Ended
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Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Table Text Block] | The Company had no derivative instruments included in its Consolidated Statements of Income in 2015 or 2014. The following tables present the effect of derivative instruments on the Company's Consolidated Statements of Income in 2013. 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 | $ | (0.2 | ) | $ | 5.2 |  | $ | — |
Interest Rate Swap | — |  | (0.2 | ) | — |
Total | $ | (0.2 | ) | $ | 5.0 |  | $ | — |
Derivatives Not Designated as Hedging Instruments
(In millions) | Amount Recognized in Income
Natural Gas Physical Purchases/Sales | $ | (6.1 | )
Natural Gas Financial Futures/Swaps | 1.0 |
Total | $ | (5.1 | )

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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 4C -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959 Reference 2: 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=56946850&loc=SL5618551-113959 + Details
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