Stock-based Compensation

6 Months Ended

Jun. 30, 2020

Share-based Payment Arrangement [Abstract]

STOCK-BASED COMPENSATION

Stock Unit Awards

Restricted stock unit ("RSU") and performance stock unit ("PSU") awards activity is presented in the following tables.



	RSU Shares (in 000's)		PSU Shares (in 000's)	Total Shares (in 000's)		Weighted Average Grant Date Fair Value		Weighted Average Remaining Contractual Life (in years)
Unvested as of March 31, 2020	1,208.9		286.8	1,495.7		$	144.71	1.78
Granted	152.3		272.0	424.3		113.67
Vested	(10.2	)	—	(10.2	)	118.91
Forfeited	(7.8	)	—	(7.8	)	143.09
Unvested as of June 30, 2020	1,343.2		558.8	1,902.0		$	137.93	2.01

Unvested as of March 31, 2019	434.3		92.7	527.0		$	140.55	2.15
Granted	37.4		166.9	204.3		150.03
Vested	(26.6	)	—	(26.6	)	118.02
Forfeited	(8.4	)	—	(8.4	)	136.19
Unvested as of June 30, 2019	436.7		259.6	696.3		$	144.17	2.25



	RSU Shares (in 000's)		PSU Shares (in 000's)		Total Shares (in 000's)		Weighted Average Grant Date Fair Value		Weighted Average Remaining Contractual Life (in years)
Unvested as of December 31, 2019	1,532.3		286.8		1,819.1		$	141.51	2.39
Granted	162.0		272.0		434.0		118.66
Vested	(334.8	)	—		(334.8	)	136.36
Forfeited	(16.3	)	—		(16.3	)	140.22
Unvested as of June 30, 2020	1,343.2		558.8		1,902.0		$	137.93	2.01

Unvested as of December 31, 2018	559.6		93.1		652.7		$	131.32	2.02
Granted	112.1		166.9		279.0		150.78
Vested	(222.1	)	—		(222.1	)	115.17
Forfeited	(12.9	)	(0.4	)	(13.3	)	132.56
Unvested as of June 30, 2019	436.7		259.6		696.3		$	144.17	2.25

As of June 30, 2020, we had $122.4 million of unamortized deferred compensation related to unvested RSUs and PSUs, which we anticipate recognizing over varying periods into 2024; $50.8 million relates to the awards issued in conjunction with the HFF acquisition.