Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

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- Definition

Derivative, Additional Cash Paid on Settlement of Hedge

+ References

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- Definition

Forecast of Commodity Requirements, Maximum Length of Time Used

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- Definition

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994

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- Definition

The amount of cash received during the period on settlement of a hedge.

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- Definition

Amount of decrease in the fair value of derivatives recognized in the income statement.

+ 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=35706170&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

-Subparagraph (a),(c),(d),(e)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959

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- Definition

The percentage of expected requirements covered by the aggregate notional amount of derivative contracts expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract as a percentage of expected need.

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- Definition

The loss recognized in earnings during the reporting period representing the amount of the cash flow hedges' ineffectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (d)(1)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959

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Derivatives (Narrative - Commodity Future Contracts) (Details) (Natural Gas Contracts, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 MMBTU	Dec. 31, 2013 MMBTU	Dec. 31, 2012
Cash Flow Hedging
Derivative [Line Items]
Forecast of commodity requirements, maximum length of time used	18 months
Natural gas contracts, notional amounts (in millions of BTUs)	3,850,000	1,520,000
Derivative, cash received on settlement of hedge	$ 0.6
Derivative,cash paid on settlement of hedge		(0.1)	(4.7)
Cash flow hedge loss to be reclassified within 12 months	1.5
Minimum [Member] \| Cash Flow Hedging
Derivative [Line Items]
Derivative, nonmonetary notional amount, percent of anticipated requirements	40.00%
Maximum [Member] \| Cash Flow Hedging
Derivative [Line Items]
Derivative, nonmonetary notional amount, percent of anticipated requirements	70.00%
Designated as Hedging Instrument \| Cash Flow Hedging
Derivative [Line Items]
Loss on cash flow hedge ineffectiveness		0.3
Not Designated as Hedging Instrument
Derivative [Line Items]
Derivative, Loss on Derivative	0.1
Not Designated as Hedging Instrument \| Cash Flow Hedging
Derivative [Line Items]
Loss on cash flow hedge ineffectiveness	$ 1.2