Earnings Per Common Share (Calculations) (Details) - $ / shares shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Earnings per common share – assuming dilution:
Weighted average common shares outstanding	225.7	233.3	226.9	234.5
Effect of dilutive securities:
Stock options	0.1	0.3	0.1	0.4
Other stock compensation plans	0.7	0.7	0.7	0.7
Potentially dilutive common shares	0.8	1.0	0.8	1.1
Adjusted weighted average common shares outstanding	226.5	234.3	227.7	235.6
Dividends per common share (in dollars per share)	$ 0.71	$ 0.68	$ 2.07	$ 1.98
Outstanding stock options excluded from the computation of diluted earnings per share due to their antidilutive effect	3.0	1.6	3.0	1.3