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Accounting for Derivative Instruments - Narrative (Details) - USD ($) $ in Millions | Jun. 30, 2015 | Dec. 31, 2014
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Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Collateral fee | $ 0.2 | $ 0.0

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- Definition The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624258-113959 + Details
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Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration