Earnings Per Common Share (Calculations) (Details) - $ / shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share, Diluted [Abstract]
Weighted average common shares outstanding	235,500	237,900	236,200	237,700
Effect of dilutive securities:
Stock options	400	1,100	600	1,000
Other stock compensation plans	700	800	700	800
Potentially dilutive common shares	1,100	1,900	1,300	1,800
Adjusted weighted average common shares outstanding	236,600	239,800	237,500	239,500
Dividends per common share (in dollars per share)	$ 0.62	$ 0.59	$ 1.80	$ 1.67
Outstanding stock options excluded from the computation of diluted earnings per share due to their antidilutive effect	900	0	900	0