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		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	0	2,509	469,677	395,051
Estimated fair value (in millions)	$ 0	$ 0.1	$ 21.9	$ 16.7
Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	0	2,509	448,549	370,445
Estimated fair value (in millions)	0	0.1	21.0	15.7
Percentage of shares granted expected to be distributed		95.00%	94.00%	94.00%
Non-employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	0	0	21,128	24,606
Estimated fair value (in millions)	$ 0	$ 0	$ 0.9	$ 1.0
Percentage of shares granted expected to be distributed		0.00%	100.00%	100.00%