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

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

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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- Definition

Maximum length of time over which the entity is hedging its exposure to the variability in future cash flows for forecasted transactions, excluding those forecasted transactions related to the payment of variable interest on existing financial instruments, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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Derivatives (Narrative - Commodity Future Contracts) (Details) - Cash Flow Hedging - Natural Gas Contracts $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($) MMBTU	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) MMBTU	Sep. 30, 2016 USD ($)	Dec. 31, 2016 MMBTU
Derivative [Line Items]
Forecast of commodity requirements, maximum length of time used			18 months
Natural gas contracts, notional amounts (in millions of BTUs) \| MMBTU	2,590,000		2,590,000		2,590,000
Derivative, Cash Received on Hedge			$ 0.2
Derivative, Additional Cash Paid on Settlement of Hedge	$ 0.1	$ 0.1		$ 2.3
Minimum
Derivative [Line Items]
Forecast of anticipated requirements, percentage of forecast eligible for hedging	40.00%		40.00%
Maximum
Derivative [Line Items]
Forecast of anticipated requirements, percentage of forecast eligible for hedging	70.00%		70.00%