Stock-Based Incentive Compensation Plans (Option price assumptions used for stock option incentive plans) (Details) - Stock Options [Member] - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Assumptions used for stock-based incentive compensation plans [Abstract]
Weighted-average fair value per option granted (in dollars per share)	$ 18.74	$ 18.27	$ 9.32
Dividend yield	2.10%	2.00%	2.80%
Expected volatility	27.20%	31.50%	35.90%
Risk-free interest rate, minimum	2.50%	1.70%	1.00%
Risk-free interest rate, maximum	2.90%	2.10%	1.60%
Expected life (in years)	5 years 9 months 18 days	5 years 6 months	5 years 8 months 12 days