Stock-Based Incentive Compensation Plans (Option price assumptions used for stock appreciation rights plan) (Details) - Non-employee Stock Appreciation Rights [Member] - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Assumptions used for stock-based incentive compensation plans [Abstract]
Weighted-average fair value per option granted (in dollars per share)	$ 14.22	$ 13.64	$ 7.47
Dividend yield	1.60%	1.50%	2.20%
Expected volatility	29.80%	32.70%	30.50%
Risk-free interest rate	1.80%	1.70%	1.00%
Expected life (in years)	5 years	5 years	5 years