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Transfers Of Financial Assets (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |  |  |  |
Accounts receivable securitization facility borrowings | $ 235.0 |  | $ 235.0 |  | $ 246.0
Net receivables transferred | 235.0 |  | 235.0 |  | $ 246.0
Cash From Financing Activities Related To The Change In Short-Term Borrowings Due To The Securitization Transactions |  |  | (11.0) | $ (177.1) |
Securitization Transaction Fees | 0.4 | $ 0.5 | $ 1.6 | $ 1.9 |
Columbia Gas Of Ohio Receivables Corporation |  |  |  |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |  |  |  |
Trade Receivable Agreement Expiration Date |  |  | Oct. 13, 2017 |  |
Net receivables transferred | 75.0 |  | $ 75.0 |  |
NIPSCO Accounts Receivable Corporation |  |  |  |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |  |  |  |
Trade Receivable Agreement Expiration Date |  |  | Aug. 23, 2017 |  |
Net receivables transferred | 150.0 |  | $ 150.0 |  |
Columbia Gas Of Pennsylvania Receivables Corporation |  |  |  |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |  |  |  |
Trade Receivable Agreement Expiration Date |  |  | Mar. 08, 2017 |  |
Net receivables transferred | 10.0 |  | $ 10.0 |  |
Maximum | Accounts Receivable Program |  |  |  |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |  |  |  |
Accounts receivable securitization facility borrowings | 515.0 |  | 515.0 |  |
Maximum | Columbia Gas Of Ohio Receivables Corporation |  |  |  |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |  |  |  |
Trade receivables, seasonal program maximum | 240.0 |  | 240.0 |  |
Maximum | NIPSCO Accounts Receivable Corporation |  |  |  |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |  |  |  |
Trade receivables, seasonal program maximum | 200.0 |  | 200.0 |  |
Maximum | Columbia Gas Of Pennsylvania Receivables Corporation |  |  |  |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |  |  |  |
Trade receivables, seasonal program maximum | $ 75.0 |  | $ 75.0 |  |

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