Stock-Based Compensation (Schedule Of Fair Value Of The Restricted Stock Awards Granted During The Periods) (Details) (Restricted Stock [Member], USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	724,442	438,342
Estimated fair value (in millions)	$ 23.6	$ 22.3
Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	724,442	438,342
Estimated fair value (in millions)	23.6	22.3
Percentage of shares granted expected to be distributed	96.00%	95.00%
Non-employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	0	0
Estimated fair value (in millions)	$ 0	$ 0