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

+ Details

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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

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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
	Mar. 31, 2014 MMBTU	Mar. 31, 2013	Dec. 31, 2013 MMBTU
Derivative [Line Items]
Natural gas contracts, notional amounts (in millions of BTUs)	1,470,000		1,520,000
Derivative, additional cash paid (received) on settlement of hedge	$ (0.5)	$ 0.2
Cash flow hedge loss to be reclassified within 12 months	$ 0.6
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