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Equity-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2018

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

Grant Date Fair Value for Awards of Performance Units Inputs

The grant date fair values for awards of performance units with market-based metrics, which were granted in the three months ended March 31, 2018 and 2017, were based on fair values as determined using a Monte Carlo simulation valuation methodology using the following key inputs:

		2018			2017
Valuation date stock price based on the February 28, 2018 and March 22, 2017 closing stock prices		$34.44			$36.31
Expected volatility		34	%		36	%
Risk-free interest rate		2.39	%		1.46	%
Term in years		2.84			2.78

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Schedule Of Share Based Payment Award, Equity Instruments Other Than Options, Valuation Assumptions [Table Text Block]

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