Share-Based Compensation - Schedule of Weighted Average Option Fair Values and Assumptions (Details) - Stock Option - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value of grants (in dollars per share)	$ 24.68	$ 20.60	$ 24.12	$ 18.41
Dividend yield	1.43%	1.63%	1.45%	1.70%
Volatility	29.32%	29.62%	29.41%	29.71%
Risk-free interest rate, minimum	1.06%	0.60%	0.83%	0.53%
Risk-free interest rate, maximum	2.90%	2.56%	3.04%	2.50%
Expected life (in years)	5 years 9 months 26 days	5 years 10 months 28 days	5 years 9 months 29 days	5 years 10 months 28 days