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, 2014	Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	438,342	448,549
Estimated fair value (in millions)	$ 22.3	$ 21.0
Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	438,342	448,549
Estimated fair value (in millions)	22.3	21.0
Percentage of shares granted expected to be distributed	95.00%	94.00%
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