Stock-Based Compensation (Schedule Of Fair Value Of The Restricted Stock Awards Granted During The Periods) (Details) - Restricted Stock [Member] - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Time Vested [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		90,000	25,848	576,578	602,209
Estimated fair value (in millions)	[1]	$ 0.9	$ 0.9	$ 3.5	$ 19.4
Time Vested [Member] | Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		0	0	486,578	576,361
Estimated fair value (in millions)	[1]	$ 0.0	$ 0.0	$ 2.6	$ 18.5
Percentage of shares granted expected to be distributed				94.00%	94.00%
Time Vested [Member] | Non-employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		90,000	25,848	90,000	25,848
Estimated fair value (in millions)	[1]	$ 0.9	$ 0.9	$ 0.9	$ 0.9
Percentage of shares granted expected to be distributed		100.00%	100.00%	100.00%	100.00%
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		0	0	152,373	148,081
Estimated fair value (in millions)	[1]	$ 0.0	$ 0.0	$ 0.8	$ 5.1
Performance Shares [Member] | Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		0	0	152,373	148,081
Estimated fair value (in millions)	[1]	$ 0.0	$ 0.0	$ 0.8	$ 5.1
Percentage of shares granted expected to be distributed				70.00%	3.00%
Performance Shares [Member] | Non-employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted		0	0	0	0
Estimated fair value (in millions)	[1]	$ 0.0	$ 0.0	$ 0.0	$ 0.0

[1] Represents 100% of the grant date fair value. (We recognize the grant date fair value minus estimated forfeitures.)