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Condensed Parent Company Financial Statements (Condensed Statements Of Income) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenues | $ 873.5 | $ 928.6 | $ 816.1 | $ 916.3 | $ 856.1 | $ 906.9 | $ 765.3 | $ 853.9 | $ 3,534.5 | $ 3,382.2 | $ 3,320.0
Operating expenses |  |  |  |  |  |  |  |  | 2,840.1 | 2,711.0 | 2,765.9
Operating income (loss) | $ 121.4 | $ 256.1 | $ 151.2 | $ 165.7 | $ 134.0 | $ 236.3 | $ 153.7 | $ 147.2 | 694.4 | 671.2 | 554.1
Other (income) and deductions: |  |  |  |  |  |  |  |  |  |  |
Equity earnings from consolidated subsidiaries |  |  |  |  |  |  |  |  | (54.6) | (44.8) | (39.6)
Interest expense |  |  |  |  |  |  |  |  | 247.0 | 215.6 | 196.2
Total other (income) and deductions |  |  |  |  |  |  |  |  | 124.4 | 138.4 | 110.7
Income from continuing operations before income taxes |  |  |  |  |  |  |  |  | 570.0 | 532.8 | 443.4
Income tax benefit |  |  |  |  |  |  |  |  | 47.7 | 66.7 | 59.4
Net income |  |  |  |  |  |  |  |  | 522.3 | 467.5 | 381.7
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 1.0
Operating expenses |  |  |  |  |  |  |  |  | 5.0 | 2.0 | 3.0
Operating income (loss) |  |  |  |  |  |  |  |  | (5.0) | (2.0) | (2.0)
Other (income) and deductions: |  |  |  |  |  |  |  |  |  |  |
Equity earnings from consolidated subsidiaries |  |  |  |  |  |  |  |  | (523.0) | (457.0) | (374.0)
Interest expense |  |  |  |  |  |  |  |  | 4.0 | 3.0 | 3.0
Other |  |  |  |  |  |  |  |  | 2.0 | 0.0 | (2.0)
Total other (income) and deductions |  |  |  |  |  |  |  |  | (517.0) | (454.0) | (373.0)
Income from continuing operations before income taxes |  |  |  |  |  |  |  |  | 512.0 | 452.0 | 371.0
Income tax benefit |  |  |  |  |  |  |  |  | (1.0) | (6.0) | (1.0)
Net income |  |  |  |  |  |  |  |  | $ 513.0 | $ 458.0 | $ 372.0

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