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, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	2,509	12,402	395,051	209,150
Estimated fair value (in millions)	$ 0.1	$ 0.6	$ 16.7	$ 10.9
Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	2,509	12,402	370,445	209,150
Estimated fair value (in millions)	0.1	0.6	15.7	10.9
Percentage of shares granted expected to be distributed	95.00%	95.00%	94.00%	93.00%
Non-employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	0		24,606
Estimated fair value (in millions)	$ 0		$ 1.0
Percentage of shares granted expected to be distributed	0.00%		100.00%