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

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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

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.

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Derivatives (Narrative - Commodity Future Contracts) (Details) - Cash Flow Hedging - Natural Gas Contracts $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($) MMBTU	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) MMBTU	Jun. 30, 2016 USD ($)	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	2,350,000		2,350,000		2,590,000
Derivative, Cash Received on Hedge	$ 0.2		$ 0.3
Derivative, Additional Cash Paid on Settlement of Hedge		$ 1.0		$ 2.2
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months			$ (0.1)
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%