Share-Based Compensation - Schedule of Weighted Average Option Fair Values and Assumptions (Details) - Stock Option - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value of grants (in dollars per share)	$ 30.46	$ 21.88	$ 24.17	$ 18.47
Dividend yield	1.27%	1.53%	1.45%	1.69%
Volatility	29.35%	29.60%	29.41%	29.71%
Risk-free interest rate, minimum	1.24%	0.51%	0.83%	0.53%
Risk-free interest rate, maximum	2.80%	2.01%	3.04%	2.50%
Expected life (in years)	5 years 9 months 29 days	5 years 10 months 28 days	5 years 9 months 29 days	5 years 10 months 28 days