Derivative Instruments (Net Cash Received (Paid) Related to Derivatives) (Schedule) (Details) - USD ($) $ in Millions |
9 Months Ended | 12 Months Ended | |
|---|---|---|---|
Sep. 30, 2014 |
Dec. 31, 2013 |
Dec. 31, 2012 |
|
| Derivative Instruments and Hedging Activities Disclosure [Abstract] | |||
| Operating activities | $ (445.7) | $ (402.1) | $ (435.5) |
| Investing activities | (30.2) | (66.5) | 23.7 |
| Financing activities | (221.0) | 524.5 | (108.4) |
| Total | $ (696.9) | $ 55.9 | $ (520.2) |