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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, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Operating revenues | $ 797.0 | $ 924.6 | $ 754.6 | $ 843.8 | $ 740.1 | $ 898.9 | $ 717.2 | $ 897.4 | $ 3,320.0 | $ 3,253.6 | $ 3,350.3
Operating expenses |  |  |  |  |  |  |  |  | 2,783.0 | 2,676.6 | 2,806.7
Operating income (loss) | $ 99.9 | $ 162.6 | $ 128.6 | $ 145.9 | $ 79.2 | $ 235.9 | $ 109.0 | $ 152.9 | 537.0 | 577.0 | 543.6
Interest expense and other: |  |  |  |  |  |  |  |  |  |  |
Equity earnings from consolidated subsidiaries |  |  |  |  |  |  |  |  | (39.6) | (33.8) | (40.4)
Interest expense |  |  |  |  |  |  |  |  | 196.2 | 187.1 | 180.6
Total interest expense and other |  |  |  |  |  |  |  |  | 93.6 | 115.7 | 103.6
Income from continuing operations before income taxes |  |  |  |  |  |  |  |  | 443.4 | 461.3 | 440.0
Income tax benefit |  |  |  |  |  |  |  |  | 59.4 | 70.4 | 44.3
Net income |  |  |  |  |  |  |  |  | 381.7 | 388.4 | 393.3
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 1.0 | 2.0 | 2.0
Operating expenses |  |  |  |  |  |  |  |  | 3.0 | 3.0 | 3.0
Operating income (loss) |  |  |  |  |  |  |  |  | (2.0) | (1.0) | (1.0)
Interest expense and other: |  |  |  |  |  |  |  |  |  |  |
Equity earnings from consolidated subsidiaries |  |  |  |  |  |  |  |  | (374.0) | (379.0) | (388.0)
Interest expense |  |  |  |  |  |  |  |  | 3.0 | 3.0 | 9.0
Interest income |  |  |  |  |  |  |  |  | (2.0) | (3.0) | (2.0)
Total interest expense and other |  |  |  |  |  |  |  |  | (373.0) | (379.0) | (381.0)
Income from continuing operations before income taxes |  |  |  |  |  |  |  |  | 371.0 | 378.0 | 380.0
Income tax benefit |  |  |  |  |  |  |  |  | (1.0) | (1.0) | (3.0)
Net income |  |  |  |  |  |  |  |  | $ 372.0 | $ 379.0 | $ 383.0

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