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Earnings Per Common Share (Calculations) (Details) - $ / shares
shares in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share, Diluted [Abstract]        
Weighted average common shares outstanding 237,900 236,800 237,700 236,600
Effect of dilutive securities:        
Stock options 1,100 500 1,000 400
Other stock compensation plans 800 600 800 700
Potentially dilutive common shares 1,900 1,100 1,800 1,100
Adjusted weighted average common shares outstanding 239,800 237,900 239,500 237,700
Dividends per common share (in dollars per share) $ 0.59 $ 0.54 $ 1.67 $ 1.56
Outstanding stock options excluded from the computation of diluted earnings per share due to their antidilutive effect 0 1,500 0 2,000