Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 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 three months ended March 31, 2018 and 2017, respectively:

	Three Months Ended March 31, 2018					Three Months Ended March 31, 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	1,566,788	$	46.18	$	151.12	2,701,644	$	25.01	$	95.66
RSUs	676,228	$	151.12	$	151.12	906,068	$	89.76	$	95.63
PRSUs	339,559	$	151.12	$	151.12	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 three months ended March 31, 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