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Quarterly Financial Information (Unaudited) (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Sep. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2015
Quarterly Financial Information, Quarterly Charges and Credits, Amount Reconciling to Previously Reported Results | $ 2.1 | $ 1.0 | $ 1.2 | $ 4.3

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- Definition Amount by which previously reported quarterly results were revised (for example, to correct an error, or to give retrospective effect to a change in an accounting principle). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56949863&loc=d3e22499-107794 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=56949863&loc=d3e22694-107794 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=56949863&loc=d3e22644-107794 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 302 -Paragraph a -Subparagraph 2 + Details
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