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Report of Business Segments (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |
Operating revenues | $ 560.4 | $ 901.4 |
Cost of sales | 293.4 | 553.0 |
Other operation and maintenance | 112.4 | 148.0 |
Depreciation and amortization | 67.2 | 91.9 |
Taxes other than income | 25.6 | 33.1 |
Operating income (loss) | 61.8 | 75.4 |
Equity in earnings of unconsolidated affiliates | 47.9 | 0 |
Investment in unconsolidated affiliates | 1,314.2 |  | 1,298.8
Total assets | 9,250.7 | 9,981.8 | 9,134.7
Electric Utility [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 560.4 | 455.5 |
Cost of sales | 293.4 | 213.0 |
Other operation and maintenance | 117.1 | 105.1 |
Depreciation and amortization | 64.3 | 61.3 |
Taxes other than income | 23.8 | 23.2 |
Operating income (loss) | 61.8 | 52.9 |
Equity in earnings of unconsolidated affiliates | 0 |  |
Investment in unconsolidated affiliates | 0 |  |
Total assets | 7,826.8 | 7,138.4 |
Natural Gas Midstream Operations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 0 | 464.3 |
Cost of sales | 0 | 359.2 |
Other operation and maintenance | 0 | 45.2 |
Depreciation and amortization | 0 | 27.6 |
Taxes other than income | 0 | 8.0 |
Operating income (loss) | 0 | 24.3 |
Equity in earnings of unconsolidated affiliates | 47.9 |  |
Investment in unconsolidated affiliates | 1,314.2 |  |
Total assets | 1,367.4 | 2,729.9 |
Other Operations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 0 | 0 |
Cost of sales | 0 | 0 |
Other operation and maintenance | (4.7) | (2.3) |
Depreciation and amortization | 2.9 | 3.0 |
Taxes other than income | 1.8 | 1.9 |
Operating income (loss) | 0 | (2.6) |
Equity in earnings of unconsolidated affiliates | 0 |  |
Investment in unconsolidated affiliates | 0 |  |
Total assets | 127.9 | 381.6 |
Eliminations [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating revenues | 0 | (18.4) |
Cost of sales | 0 | (19.2) |
Other operation and maintenance | 0 | 0 |
Depreciation and amortization | 0 | 0 |
Taxes other than income | 0 | 0 |
Operating income (loss) | 0 | 0.8 |
Equity in earnings of unconsolidated affiliates | 0 |  |
Investment in unconsolidated affiliates | 0 |  |
Total assets | $ (71.4) | $ (268.1) |

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