Gain On Sale Of Assets (Narrative) (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
Dec. 31, 2015 |
|
| Gain On Sale of Assets [Abstract] | |||||
| Gain on Conveyances | $ 9.7 | $ 36.0 | $ 15.7 | $ 49.6 | |
| Gain on Conveyances Cash Received | 9.0 | 35.8 | |||
| Deferred Gains On Conveyances | $ 1.3 | $ 1.3 | $ 8.1 | ||