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

No definition available.

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- Definition

Forecast of Commodity Requirements, Maximum Length of Time Used

+ References

No definition available.

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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=7668309&loc=d3e80748-113994

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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.

+ References

No definition available.

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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=7476318&loc=SL5624171-113959

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Derivatives (Narrative - Commodity Future Contracts) (Details) (Cash Flow Hedging [Member], Natural gas contracts [Member], USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2013 MMBTU	Sep. 30, 2012	Dec. 31, 2012 MMBTU
Derivative [Line Items]
Natural gas contracts, notional amounts (in millions of BTUs)		1,620,000		2,400,000
Loss on cash flow hedge ineffectiveness		$ 0.3
Derivative, additional cash paid (received) on settlement of hedge	1.1		4.3
Cash flow hedge loss to be reclassified within 12 months		$ 0.2
Minimum [Member]
Derivative [Line Items]
Forecast of anticipated requirements, percentage of forecast eligible for hedging		40.00%
Maximum [Member]
Derivative [Line Items]
Forecast of anticipated requirements, percentage of forecast eligible for hedging		70.00%
Forecast of commodity requirements, maximum length of time used		18 months