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Report of Business Segments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | $ 551.4 | $ 549.9 | $ 984.5 | $ 1,030.0 |
Cost of sales | 197.7 | 210.9 | 375.6 | 422.5 |
Other operation and maintenance | 127.6 | 113.2 | 241.5 | 224.9 |
Depreciation and amortization | 80.1 | 76.2 | 158.6 | 152.1 |
Taxes other than income | 20.1 | 22.4 | 45.0 | 46.9 |
OPERATING INCOME | 125.9 | 127.2 | 163.8 | 183.6 |
Equity in earnings of unconsolidated affiliates | 16.7 | 28.2 | 45.0 | 59.9 |
Other income (expense) | 5.5 | 5.1 | 11.0 | 10.5 |
Interest expense | 36.0 | 38.0 | 72.3 | 75.4 |
Income tax expense (benefit) | 40.6 | 35.0 | 50.8 | 47.9 |
Net income (loss) | 71.5 | 87.5 | 96.7 | 130.7 |
Investment in unconsolidated affiliates | 1,168.8 | 1,309.2 | 1,168.8 | 1,309.2 | $ 1,194.4
Total assets | 9,659.2 | 9,576.1 | 9,659.2 | 9,576.1 | $ 9,580.6
Electric Utility [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating revenues | 551.4 | 549.9 | 984.5 | 1,030.0 |
Cost of sales | 197.7 | 210.9 | 375.6 | 422.5 |
Other operation and maintenance | 124.8 | 115.6 | 241.1 | 229.9 |
Depreciation and amortization | 78.4 | 74.3 | 155.1 | 148.1 |
Taxes other than income | 19.1 | 21.6 | 42.7 | 44.7 |
OPERATING INCOME | 131.4 | 127.5 | 170.0 | 184.8 |
Equity in earnings of unconsolidated affiliates | 0.0 | 0.0 | 0.0 | 0.0 |
Other income (expense) | 7.0 | 4.4 | 12.3 | 7.3 |
Interest expense | 35.0 | 37.3 | 70.5 | 74.1 |
Income tax expense (benefit) | 31.1 | 25.6 | 33.4 | 31.9 |
Net income (loss) | 72.3 | 69.0 | 78.4 | 86.1 |
Investment in unconsolidated affiliates | 0.0 | 0.0 | 0.0 | 0.0 |
Total assets | 8,380.2 | 8,315.7 | 8,380.2 | 8,315.7 |
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 | 7.8 | 0.2 | 8.0 | 1.0 |
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 | (7.8) | (0.2) | (8.0) | (1.0) |
Equity in earnings of unconsolidated affiliates | 16.7 | 28.2 | 45.0 | 59.9 |
Other income (expense) | 0.0 | 0.0 | 0.0 | 0.0 |
Interest expense | 0.0 | 0.0 | 0.0 | 0.0 |
Income tax expense (benefit) | 9.3 | 10.0 | 19.4 | 18.1 |
Net income (loss) | (0.4) | 18.0 | 17.6 | 40.8 |
Investment in unconsolidated affiliates | 1,168.8 | 1,309.2 | 1,168.8 | 1,309.2 |
Total assets | 1,481.8 | 1,486.6 | 1,481.8 | 1,486.6 |
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 | (5.0) | (2.6) | (7.6) | (6.0) |
Depreciation and amortization | 1.7 | 1.9 | 3.5 | 4.0 |
Taxes other than income | 1.0 | 0.8 | 2.3 | 2.2 |
OPERATING INCOME | 2.3 | (0.1) | 1.8 | (0.2) |
Equity in earnings of unconsolidated affiliates | 0.0 | 0.0 | 0.0 | 0.0 |
Other income (expense) | (1.4) | 0.8 | (1.1) | 3.3 |
Interest expense | 1.1 | 0.8 | 2.0 | 1.4 |
Income tax expense (benefit) | 0.2 | (0.6) | (2.0) | (2.1) |
Net income (loss) | (0.4) | 0.5 | 0.7 | 3.8 |
Investment in unconsolidated affiliates | 0.0 | 0.0 | 0.0 | 0.0 |
Total assets | 94.9 | 121.8 | 94.9 | 121.8 |
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) | (0.1) | (0.2) | (0.1) |
Interest expense | (0.1) | (0.1) | (0.2) | (0.1) |
Income tax expense (benefit) | 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 | $ (297.7) | $ (348.0) | $ (297.7) | $ (348.0) |

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