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Report of Business Segments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | $ 549.9 | $ 611.8 | $ 1,030.0 | $ 1,172.2 |
Cost of sales | 210.9 | 270.9 | 422.5 | 564.3 |
Other operation and maintenance | 113.2 | 111.4 | 224.9 | 223.8 |
Depreciation and amortization | 76.2 | 68.3 | 152.1 | 135.5 |
Taxes other than income | 22.4 | 19.4 | 46.9 | 45.0 |
OPERATING INCOME | 127.2 | 141.8 | 183.6 | 203.6 |
Equity in earnings of unconsolidated affiliates | 28.2 | 39.3 | 59.9 | 87.2 |
Other income (expense) | 5.1 | 1.8 | 10.5 | 1.0 |
Interest expense | 38.0 | 39.4 | 75.4 | 75.3 |
Income tax expense | 35.0 | 42.7 | 47.9 | 66.4 |
Net income (loss) | 87.5 | 100.8 | 130.7 | 150.1 |
Investment in unconsolidated affiliates | 1,309.2 | 1,309.6 | 1,309.2 | 1,309.6 | $ 1,318.2
Total assets | 9,593.6 | 9,324.3 | 9,593.6 | 9,324.3 | $ 9,527.8
Electric Utility [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 549.9 | 611.8 | 1,030.0 | 1,172.2 |
Cost of sales | 210.9 | 270.9 | 422.5 | 564.3 |
Other operation and maintenance | 115.6 | 115.0 | 229.9 | 232.1 |
Depreciation and amortization | 74.3 | 65.0 | 148.1 | 129.3 |
Taxes other than income | 21.6 | 18.7 | 44.7 | 42.5 |
OPERATING INCOME | 127.5 | 142.2 | 184.8 | 204.0 |
Equity in earnings of unconsolidated affiliates | 0.0 | 0.0 | 0.0 | 0.0 |
Other income (expense) | 4.4 | 1.2 | 7.3 | 1.6 |
Interest expense | 37.3 | 37.5 | 74.1 | 71.4 |
Income tax expense | 25.6 | 29.0 | 31.9 | 36.6 |
Net income (loss) | 69.0 | 76.9 | 86.1 | 97.6 |
Investment in unconsolidated affiliates | 0.0 | 0.0 | 0.0 | 0.0 |
Total assets | 8,332.6 | 7,908.0 | 8,332.6 | 7,908.0 |
Natural Gas Midstream Operations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 0.0 | 0.0 | 0.0 | 0.0 |
Cost of sales | 0.0 | 0.0 | 0.0 | 0.0 |
Other operation and maintenance | 0.2 | 0.4 | 1.0 | 0.4 |
Depreciation and amortization | 0.0 | 0.0 | 0.0 | 0.0 |
Taxes other than income | 0.0 | 0.0 | 0.0 | 0.0 |
OPERATING INCOME | (0.2) | (0.4) | (1.0) | (0.4) |
Equity in earnings of unconsolidated affiliates | 28.2 | 39.3 | 59.9 | 87.2 |
Other income (expense) | 0.0 | 0.0 | 0.0 | 0.0 |
Interest expense | 0.0 | 0.0 | 0.0 | 0.0 |
Income tax expense | 10.0 | 14.9 | 18.1 | 33.4 |
Net income (loss) | 18.0 | 24.0 | 40.8 | 53.4 |
Investment in unconsolidated affiliates | 1,309.2 | 1,309.6 | 1,309.2 | 1,309.6 |
Total assets | 1,486.6 | 1,371.8 | 1,486.6 | 1,371.8 |
Other Operations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 0.0 | 0.0 | 0.0 | 0.0 |
Cost of sales | 0.0 | 0.0 | 0.0 | 0.0 |
Other operation and maintenance | (2.6) | (4.0) | (6.0) | (8.7) |
Depreciation and amortization | 1.9 | 3.3 | 4.0 | 6.2 |
Taxes other than income | 0.8 | 0.7 | 2.2 | 2.5 |
OPERATING INCOME | (0.1) | 0.0 | (0.2) | 0.0 |
Equity in earnings of unconsolidated affiliates | 0.0 | 0.0 | 0.0 | 0.0 |
Other income (expense) | 0.8 | 0.6 | 3.3 | (0.6) |
Interest expense | 0.8 | 1.9 | 1.4 | 3.9 |
Income tax expense | (0.6) | (1.2) | (2.1) | (3.6) |
Net income (loss) | 0.5 | (0.1) | 3.8 | (0.9) |
Investment in unconsolidated affiliates | 0.0 | 0.0 | 0.0 | 0.0 |
Total assets | 122.4 | 141.0 | 122.4 | 141.0 |
Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 0.0 | 0.0 | 0.0 | 0.0 |
Cost of sales | 0.0 | 0.0 | 0.0 | 0.0 |
Other operation and maintenance | 0.0 | 0.0 | 0.0 | 0.0 |
Depreciation and amortization | 0.0 | 0.0 | 0.0 | 0.0 |
Taxes other than income | 0.0 | 0.0 | 0.0 | 0.0 |
OPERATING INCOME | 0.0 | 0.0 | 0.0 | 0.0 |
Equity in earnings of unconsolidated affiliates | 0.0 | 0.0 | 0.0 | 0.0 |
Other income (expense) | (0.1) | 0.0 | (0.1) | 0.0 |
Interest expense | (0.1) | 0.0 | (0.1) | 0.0 |
Income tax expense | 0.0 | 0.0 | 0.0 | 0.0 |
Net income (loss) | 0.0 | 0.0 | 0.0 | 0.0 |
Investment in unconsolidated affiliates | 0.0 | 0.0 | 0.0 | 0.0 |
Total assets | $ (348.0) | $ (96.5) | $ (348.0) | $ (96.5) |

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