Earnings Per Common Share (Calculations) (Details) - $ / shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Earnings Per Share, Diluted [Abstract]
Weighted average common shares outstanding	236,400	237,800	236,500	237,600
Effect of dilutive securities:
Stock options	500	1,200	700	1,000
Other stock compensation plans	700	800	700	800
Potentially dilutive common shares	1,200	2,000	1,400	1,800
Adjusted weighted average common shares outstanding	237,600	239,800	237,900	239,400
Dividends per common share (in dollars per share)	$ 0.59	$ 0.54	$ 1.18	$ 1.08
Outstanding stock options excluded from the computation of diluted earnings per share due to their antidilutive effect	1,000			500