Share-Based Compensation - Schedule of Weighted Average Option Fair Values and Assumptions (Details) - Stock Option - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value of grants (in dollars per share)	$ 24.19	$ 18.56	$ 20.32
Dividend yield	1.45%	1.69%	1.45%
Volatility	29.41%	29.70%	29.90%
Risk-free interest rate, minimum	0.83%	0.53%	0.24%
Risk-free interest rate, maximum	3.04%	2.49%	2.82%
Expected life (in years)	5 years 9 months 29 days	5 years 10 months 28 days	5 years 11 months 5 days