Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2020

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Nonvested Restricted Stock Awards Activity

The following table summarizes restricted stock awards activity for the nine months ended September 30, 2020:

	Time-Based					Market-Based
	Restricted Stock Awards					Restricted Stock Awards
	Shares			Weighted Average Grant Date Fair Value		Shares			Weighted Average Grant Date Fair Value
Unvested shares of restricted stock outstanding at December 31, 2019		742.6		$	107.93		—		$	—
Granted		152.9		$	281.02		360.9		$	216.69
Vested		(288.6	)	$	98.78		—		$	251.33
Forfeited		(41.0	)	$	171.11		(3.4	)	$	251.33
Unvested shares of restricted stock outstanding at September 30, 2020		565.9		$	154.78		357.5		$	216.35