Stock-Based Compensation (Stock Units Converted To Common Stock) (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
---|---|---|---|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
|
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | |||
Total intrinsic value of vested stock units converted to common stock | $ 9.2 | $ 7.0 | $ 4.7 |