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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, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating revenues | $ 856.1 | $ 906.9 | $ 765.3 | $ 853.9 | $ 797.0 | $ 924.6 | $ 754.6 | $ 843.8 | $ 3,382.2 | $ 3,320.0 | $ 3,253.6
Operating expenses |  |  |  |  |  |  |  |  | 2,728.8 | 2,783.0 | 2,676.6
Operating income (loss) | $ 129.7 | $ 231.5 | $ 149.3 | $ 142.9 | $ 99.9 | $ 162.6 | $ 128.6 | $ 145.9 | 653.4 | 537.0 | 577.0
Interest expense and other: |  |  |  |  |  |  |  |  |  |  |
Equity earnings from consolidated subsidiaries |  |  |  |  |  |  |  |  | (44.8) | (39.6) | (33.8)
Interest expense |  |  |  |  |  |  |  |  | 215.6 | 196.2 | 187.1
Total interest expense and other |  |  |  |  |  |  |  |  | 120.6 | 93.6 | 115.7
Income from continuing operations before income taxes |  |  |  |  |  |  |  |  | 532.8 | 443.4 | 461.3
Income tax benefit |  |  |  |  |  |  |  |  | 66.7 | 59.4 | 70.4
Net income |  |  |  |  |  |  |  |  | 467.5 | 381.7 | 388.4
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 0.0 | 1.0 | 2.0
Operating expenses |  |  |  |  |  |  |  |  | 2.0 | 3.0 | 3.0
Operating income (loss) |  |  |  |  |  |  |  |  | (2.0) | (2.0) | (1.0)
Interest expense and other: |  |  |  |  |  |  |  |  |  |  |
Equity earnings from consolidated subsidiaries |  |  |  |  |  |  |  |  | (457.0) | (374.0) | (379.0)
Interest expense |  |  |  |  |  |  |  |  | 3.0 | 3.0 | 3.0
Interest income |  |  |  |  |  |  |  |  | 0.0 | (2.0) | (3.0)
Total interest expense and other |  |  |  |  |  |  |  |  | (454.0) | (373.0) | (379.0)
Income from continuing operations before income taxes |  |  |  |  |  |  |  |  | 452.0 | 371.0 | 378.0
Income tax benefit |  |  |  |  |  |  |  |  | (6.0) | (1.0) | (1.0)
Net income |  |  |  |  |  |  |  |  | $ 458.0 | $ 372.0 | $ 379.0

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