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Accumulated Other Comprehensive Loss | 6 Months Ended
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Jun. 30, 2013
Other Comprehensive Income (Loss), Tax [Abstract] |
Accumulated Other Comprehensive Loss | Accumulated Other Comprehensive Loss The following tables display the components of Accumulated Other Comprehensive Loss for the three and six months ended June 30, 2013:
Three Months Ended June 30, 2013 (in millions) | Gains and Losses on Securities(1) |  | Gains and Losses on Cash Flow Hedges(1) |  | Pension and OPEB Items(1) |  | Accumulated Other Comprehensive Loss(1)
Balance as of April 1, 2013 | $ | 2.2 |  |  | $ | (27.7 | ) |  | $ | (36.8 | ) |  | $ | (62.3 | )
Other comprehensive income before reclassifications | (2.8 | ) |  | (0.1 | ) |  | 1.9 |  |  | (1.0 | )
Amounts reclassified from accumulated other comprehensive income | (0.1 | ) |  | 0.6 |  |  | 0.8 |  |  | 1.3 |
Net current-period other comprehensive income | (2.9 | ) |  | 0.5 |  |  | 2.7 |  |  | 0.3 |
Balance as of June 30, 2013 | $ | (0.7 | ) |  | $ | (27.2 | ) |  | $ | (34.1 | ) |  | $ | (62.0 | )
Six Months Ended June 30, 2013 (in millions) | Gains and Losses on Securities(1) |  | Gains and Losses on Cash Flow Hedges(1) |  | Pension and OPEB Items(1) |  | Accumulated Other Comprehensive Loss(1)
Balance as of January 1, 2013 | $ | 2.6 |  |  | $ | (28.6 | ) |  | $ | (39.5 | ) |  | $ | (65.5 | )
Other comprehensive income before reclassifications | (2.9 | ) |  | — |  |  | 3.2 |  |  | 0.3 |
Amounts reclassified from accumulated other comprehensive income | (0.4 | ) |  | 1.4 |  |  | 2.2 |  |  | 3.2 |
Net current-period other comprehensive income | (3.3 | ) |  | 1.4 |  |  | 5.4 |  |  | 3.5 |
Balance as of June 30, 2013 | $ | (0.7 | ) |  | $ | (27.2 | ) |  | $ | (34.1 | ) |  | $ | (62.0 | )
(1)All amounts are net of tax. Amounts in parentheses indicate debits. Equity Investment As Millennium is an equity method investment, NiSource is required to recognize a proportional share of Millennium’s OCI. The remaining unrecognized loss at June 30, 2013 of $18.2 million, net of tax, related to terminated interest rate swaps is being amortized over the period ending June 2025 into earnings using the effective interest method through interest expense as interest payments are made by Millennium. The unrecognized loss of $18.2 million and $18.7 million at June 30, 2013 and December 31, 2012, respectively, is included in gains and losses on cash flow hedges above.

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e689-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669619-108580 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e640-108580 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e716-108580 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e709-108580 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Reclassification Adjustments -URI http://asc.fasb.org/extlink&oid=6522872 + Details
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