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Short-Term Borrowings | 6 Months Ended
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Jun. 30, 2013
Short-term Debt [Abstract] |
Short-Term Borrowings | Short-Term Borrowings During June 2011, NiSource Finance implemented a new commercial paper program with a program limit of up to $500.0 million with a dealer group comprised of Barclays, Citigroup, Credit Suisse and Wells Fargo. The program capacity was expanded to $1.5 billion with the addition of RBS as a fifth dealer on February 15, 2013. Commercial paper issuances are supported by available capacity under NiSource’s $1.5 billion unsecured revolving credit facility, which expires in May 2017. At June 30, 2013, NiSource had $117.6 million of commercial paper outstanding. During May 2012, NiSource Finance amended its existing $1.5 billion revolving credit facility with a syndicate of banks led by Barclays Capital extending the termination date to May 15, 2017 and also reducing the borrowing costs under the facility. The purpose of the facility is to fund ongoing working capital requirements including the provision of liquidity support for NiSource’s commercial paper program, provide for issuance of letters of credit, and also for general corporate purposes. At June 30, 2013, NiSource had no outstanding borrowings under this facility. As of June 30, 2013 and December 31, 2012, NiSource had $38.6 million and $36.4 million of stand-by letters of credit outstanding, of which $20.7 million and $18.3 million were under the revolving credit facility, respectively. Transfers of accounts receivable are accounted for as secured borrowings resulting in the recognition of short-term debt on the Condensed Consolidated Balance Sheets (unaudited) in the amount of $260.1 million and $233.3 million as of June 30, 2013 and December 31, 2012, respectively. Refer to Note 9, “Transfers of Financial Assets,” for additional information.
(in millions) | June 30, 2013 |  | December 31, 2012
Commercial Paper weighted average interest rate of 0.69% and 1.11% at June 30, 2013 and December 31, 2012, respectively. | $ | 117.6 |  |  | $ | 499.6 |
Credit facilities borrowings weighted average interest rate of 3.73% at December 31, 2012. | — |  |  | 44.0 |
Accounts receivable securitization facility borrowings | 260.1 |  |  | 233.3 |
Total short-term borrowings | $ | 377.7 |  |  | $ | 776.9 |
Given their turnover is less than 90 days, cash flows related to the borrowings and repayments of the items listed above are presented net in the Condensed Statements of Consolidated Cash Flows (unaudited).

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- Definition The entire disclosure for short-term debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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