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Report of Business Segments (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 5 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating revenues | $ 723.2 | $ 1,113.4 |  | $ 2,358.8 | $ 2,809.1 |
Cost of goods sold | 273.0 | 539.6 |  | 1,196.6 | 1,434.2 |
Gross margin on revenues | 450.2 | 573.8 |  | 1,162.2 | 1,374.9 |
Other operation and maintenance | 102.2 | 147.1 |  | 372.2 | 447.7 |
Depreciation and amortization | 65.4 | 93.0 |  | 231.7 | 270.1 |
Impairment of assets | 0 | 0 |  | 0 | 0.3 |
Gain on insurance proceeds | 0 | 0 |  | 0 | (7.5) |
Taxes other than income | 21.7 | 29.7 |  | 78.1 | 84.7 |
Operating income (loss) | 260.9 | 304.0 |  | 480.2 | 579.6 |
Equity in earnings of unconsolidated affiliates | 46.0 | 0 | 64.5 | 64.5 | 0 |
Investment in unconsolidated affiliates | 1,295.8 |  | 1,295.8 | 1,295.8 |  | 0
Total assets | 9,144.2 | 9,706.0 | 9,144.2 | 9,144.2 | 9,706.0 | 9,922.2
Electric Utility [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating revenues | 723.2 | 721.0 |  | 1,753.3 | 1,675.7 |
Cost of goods sold | 273.0 | 271.8 |  | 733.6 | 671.9 |
Gross margin on revenues | 450.2 | 449.2 |  | 1,019.7 | 1,003.8 |
Other operation and maintenance | 105.9 | 108.6 |  | 318.0 | 333.9 |
Depreciation and amortization | 62.5 | 63.5 |  | 185.8 | 185.9 |
Impairment of assets |  |  |  |  | 0 |
Gain on insurance proceeds |  |  |  |  | 0 |
Taxes other than income | 20.8 | 19.1 |  | 63.9 | 58.4 |
Operating income (loss) | 261.0 | 258.0 |  | 452.0 | 425.6 |
Equity in earnings of unconsolidated affiliates | 0 |  |  | 0 |  |
Investment in unconsolidated affiliates | 0 |  | 0 | 0 |  |
Total assets | 7,704.0 | 7,082.3 | 7,704.0 | 7,704.0 | 7,082.3 |
Natural Gas Midstream Operations [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating revenues | 0 | 412.4 |  | 630.4 | 1,186.0 |
Cost of goods sold | 0 | 288.6 |  | 489.0 | 816.5 |
Gross margin on revenues | 0 | 123.8 |  | 141.4 | 369.5 |
Other operation and maintenance | 0 | 42.3 |  | 60.9 | 127.3 |
Depreciation and amortization | 0 | 26.5 |  | 36.8 | 74.2 |
Impairment of assets |  |  |  |  | 0.3 |
Gain on insurance proceeds |  |  |  |  | (7.5) |
Taxes other than income | 0 | 9.8 |  | 10.5 | 22.8 |
Operating income (loss) | 0 | 45.2 |  | 33.2 | 152.4 |
Equity in earnings of unconsolidated affiliates | 46.0 |  |  | 64.5 |  |
Investment in unconsolidated affiliates | 1,295.8 |  | 1,295.8 | 1,295.8 |  |
Total assets | 1,311.3 | 2,562.7 | 1,311.3 | 1,311.3 | 2,562.7 |
Other Operations [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating revenues | 0 | 0 |  | 0 | 0 |
Cost of goods sold | 0 | 0 |  | 0 | 0 |
Gross margin on revenues | 0 | 0 |  | 0 | 0 |
Other operation and maintenance | (3.7) | (3.8) |  | (6.7) | (13.5) |
Depreciation and amortization | 2.9 | 3.0 |  | 9.1 | 10.0 |
Impairment of assets |  |  |  |  | 0 |
Gain on insurance proceeds |  |  |  |  | 0 |
Taxes other than income | 0.9 | 0.8 |  | 3.7 | 3.5 |
Operating income (loss) | (0.1) | 0 |  | (6.1) | 0 |
Equity in earnings of unconsolidated affiliates | 0 |  |  | 0 |  |
Investment in unconsolidated affiliates | 0 |  | 0 | 0 |  |
Total assets | 172.2 | 276.6 | 172.2 | 172.2 | 276.6 |
Eliminations [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating revenues | 0 | (20.0) |  | (24.9) | (52.6) |
Cost of goods sold | 0 | (20.8) |  | (26.0) | (54.2) |
Gross margin on revenues | 0 | 0.8 |  | 1.1 | 1.6 |
Other operation and maintenance | 0 | 0 |  | 0 | 0 |
Depreciation and amortization | 0 | 0 |  | 0 | 0 |
Impairment of assets |  |  |  |  | 0 |
Gain on insurance proceeds |  |  |  |  | 0 |
Taxes other than income | 0 | 0 |  | 0 | 0 |
Operating income (loss) | 0 | 0.8 |  | 1.1 | 1.6 |
Equity in earnings of unconsolidated affiliates | 0 |  |  | 0 |  |
Investment in unconsolidated affiliates | 0 |  | 0 | 0 |  |
Total assets | $ (43.3) | $ (215.6) | $ (43.3) | $ (43.3) | $ (215.6) |

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