Stock-Based Incentive Compensation Plans (Option price assumptions used for stock option incentive plans) (Details) (Stock options [Member], USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock options [Member]
Assumptions used for stock-based incentive compensation plans [Abstract]
Weighted-average fair value per option granted (in dollars per share)	$ 12.95	$ 7.39	$ 8.35
Dividend yield	2.20%	2.40%	1.90%
Expected volatility	33.20%	34.10%	42.00%
Risk-free interest rate, minimum	0.90%	0.60%	0.90%
Risk-free interest rate, maximum	1.80%	0.90%	1.20%
Expected life (in years)	5 years 4 months 24 days	5 years 7 months 6 days	5 years 9 months 18 days