Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of type and fair value of the stock-based compensation awards granted during the period

The following table illustrates the type and fair value of the stock-based compensation awards granted during the nine months ended September 30, 2018 and 2017, respectively:

	Nine Months Ended September 30, 2018					Nine Months Ended September 30, 2017
	Shares Granted	Weighted-Average Fair Value Per Share		Weighted-Average Grant Date Stock Price		Shares Granted	Weighted-Average Fair Value Per Share		Weighted-Average Grant Date Stock Price
Stock options	1,605,220	$	46.11	$	150.90	2,701,644	$	25.01	$	95.66
RSUs	722,521	$	150.64	$	150.64	924,421	$	90.11	$	96.01
PRSUs	344,866	$	150.93	$	150.93	437,385	$	86.78	$	95.66

Schedule providing assumptions used in determining the fair value of stock-based awards

The following table provides the assumptions used in determining the fair value of the stock-based awards for the nine months ended September 30, 2018 and 2017, respectively:

	Grant Year
	2018		2017
Weighted-average dividend yield	2.70	%	3.42	%
Weighted-average volatility	30.2	%	29.2	%
Range of volatilities	21.5-33.0%		22.1-33.0%
Range of risk-free interest rates	2.02-2.87%		0.81-2.35%
Weighted-average expected lives	8 years		8 years