(Summary Of Activity Of Restricted Stock Award Program) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares/units, outstanding	5,514,728	5,766,477	5,799,884
Shares/units, granted	2,171,385	2,353,613	1,751,235
Shares/units, shares issued	(1,221,950)	(2,367,135)	(1,588,642)
Shares/units, forfeited	(844,138)	(238,227)	(196,000)
Shares/Units, outstanding	5,620,025	5,514,728	5,766,477
Weighted average grant date fair value, outstanding	$ 41.14	$ 38.79	$ 36.17
Weighted average grant date fair value, granted	49.15	43.49	62.97
Weighted average grant date fair value, shares issued	51.70	36.79	53.67
Weighted average grant date fair value, forfeited	51.70	50.64	56.57
Weighted average grant date fair value, outstanding	$ 40.36	$ 41.14	$ 38.79
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares/units, outstanding	160,700	132,111	166,300
Shares/units, granted	82,228	87,910	66,100
Shares/units, shares issued	(83,053)	(52,021)	(100,289)
Shares/units, forfeited	(33,800)	(7,300)	0
Shares/Units, outstanding	126,075	160,700	132,111
Weighted average grant date fair value, outstanding	$ 47.27	$ 50.17	$ 48.63
Weighted average grant date fair value, granted	40.12	43.70	51.43
Weighted average grant date fair value, shares issued	44.25	48.90	48.44
Weighted average grant date fair value, forfeited	46.43	45.10	0
Weighted average grant date fair value, outstanding	$ 44.83	$ 47.27	$ 50.17