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New Accounting Standards (Details) - USD ($) $ in Millions | Jun. 30, 2016 | Dec. 31, 2015
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Line of Credit Facility [Line Items] |  |
New Accounting Standard, Hypothetical Retrospective Adjustment |  | $ (41.3)
Unamortized Debt Issuance Expense |  | 18.1
Line of Credit [Member] |  |
Line of Credit Facility [Line Items] |  |
Unamortized Debt Issuance Expense | $ 21.5 | 15.4
Long-Term Senior Notes [Member] |  |
Line of Credit Facility [Line Items] |  |
Unamortized Debt Issuance Expense | $ 2.5 | $ 2.7

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- Definition New Accounting Standard, Hypothetical Retrospective Adjustment + References No definition available. + Details
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- Definition The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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