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Report of Business Segments (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | $ 611.8 | $ 734.2 | $ 1,172.2 | $ 1,635.6 |
Cost of sales | 270.9 | 370.6 | 564.3 | 923.6 |
Other operation and maintenance | 111.4 | 122.0 | 223.8 | 270.0 |
Depreciation and amortization | 68.3 | 74.4 | 135.5 | 166.3 |
Taxes other than income | 19.4 | 23.3 | 45.0 | 56.4 |
Operating income (loss) | 141.8 | 143.9 | 203.6 | 219.3 |
Equity in earnings of unconsolidated affiliates | 39.3 | 18.5 | 87.2 | 18.5 |
Investment in unconsolidated affiliates | 1,309.6 | 1,267.2 | 1,309.6 | 1,267.2 | 1,298.8
Total assets | 9,324.3 | 8,848.5 | 9,324.3 | 8,848.5 | 9,134.7
Electric Utility [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 611.8 | 574.6 | 1,172.2 | 1,030.1 |
Cost of sales | 270.9 | 247.6 | 564.3 | 460.6 |
Other operation and maintenance | 115.0 | 107.0 | 232.1 | 212.1 |
Depreciation and amortization | 65.0 | 62.0 | 129.3 | 123.3 |
Taxes other than income | 18.7 | 19.9 | 42.5 | 43.1 |
Operating income (loss) | 142.2 | 138.1 | 204.0 | 191.0 |
Equity in earnings of unconsolidated affiliates | 0 | 0 | 0 | 0 |
Investment in unconsolidated affiliates | 0 | 0 | 0 | 0 |
Total assets | 7,908.0 | 7,453.6 | 7,908.0 | 7,453.6 |
Natural Gas Midstream Operations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 0 | 166.1 | 0 | 630.4 |
Cost of sales | 0 | 129.7 | 0 | 489.0 |
Other operation and maintenance | 0.4 | 15.7 | 0.4 | 60.9 |
Depreciation and amortization | 0 | 9.2 | 0 | 36.8 |
Taxes other than income | 0 | 2.5 | 0 | 10.5 |
Operating income (loss) | (0.4) | 9.0 | (0.4) | 33.2 |
Equity in earnings of unconsolidated affiliates | 39.3 | 18.5 | 87.2 | 18.5 |
Investment in unconsolidated affiliates | 1,309.6 | 1,267.2 | 1,309.6 | 1,267.2 |
Total assets | 1,371.8 | 1,266.8 | 1,371.8 | 1,266.8 |
Other Operations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 0 | 0 | 0 | 0 |
Cost of sales | 0 | 0 | 0 | 0 |
Other operation and maintenance | (4.0) | (0.7) | (8.7) | (3.0) |
Depreciation and amortization | 3.3 | 3.2 | 6.2 | 6.2 |
Taxes other than income | 0.7 | 0.9 | 2.5 | 2.8 |
Operating income (loss) | 0 | (3.4) | 0 | (6.0) |
Equity in earnings of unconsolidated affiliates | 0 | 0 | 0 | 0 |
Investment in unconsolidated affiliates | 0 | 0 | 0 | 0 |
Total assets | 141.0 | 189.4 | 141.0 | 189.4 |
Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 0 | (6.5) | 0 | (24.9) |
Cost of sales | 0 | (6.7) | 0 | (26.0) |
Other operation and maintenance | 0 | 0 | 0 | 0 |
Depreciation and amortization | 0 | 0 | 0 | 0 |
Taxes other than income | 0 | 0 | 0 | 0 |
Operating income (loss) | 0 | 0.2 | 0 | 1.1 |
Equity in earnings of unconsolidated affiliates | 0 | 0 | 0 | 0 |
Investment in unconsolidated affiliates | 0 | 0 | 0 | 0 |
Total assets | $ (96.5) | $ (61.3) | $ (96.5) | $ (61.3) |

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