Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 2017

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

Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions

The following assumptions were used to determine the grant date fair value of the equity component (February 22, 2017) and the period-end fair value of the liability component of the TSR Performance Share Awards:

	Grant Date			September 30, 2017
Fair value per performance share award	$	19.85		$12.28-$20.22
Assumptions:
Stock price volatility	37.8		%	20.8% - 39.9%
Risk free rate of return	1.4		%	1.1% - 1.5%