Stock-Based Incentive Compensation Plans (Option price assumptions used for stock option incentive plans) (Details) - Stock Options [Member] - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Assumptions:
Weighted-average fair value per option granted (in dollars per share)	$ 13.23	$ 18.74	$ 18.27
Dividend yield	2.80%	2.10%	2.00%
Expected volatility	26.90%	27.20%	31.50%
Risk-free interest rate, minimum	2.10%	2.50%	1.70%
Risk-free interest rate, maximum	2.50%	2.90%	2.10%
Expected life (in years)	5 years 9 months 18 days	5 years 9 months 18 days	5 years 6 months