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Common Equity Automatic Dividend Reinvestment and Stock Purchase Plan (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2015 | Jun. 30, 2014
Proceeds From Issuance of Shares Under Dividend Reinvestment Plan And Stock Purchase Plan |  | $ 6.8 | $ 6.7
Automatic Dividend Reinvestment and Stock Purchase Plan [Member] |  |  |
Stock Issued During Period, Shares, Dividend Reinvestment Plan and Stock Purchase Plan | 111,004 | 200,872 |
Proceeds From Issuance of Shares Under Dividend Reinvestment Plan And Stock Purchase Plan | $ 3.5 | $ 6.8 |
Shares Held in Reserve Related to Dividend Reinvestment Plan and Stock Purchase Plan | 4,790,940 | 4,790,940 |

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