Stock-based Payments (Tables)

9 Months Ended

Sep. 30, 2020

Share-based Payment Arrangement [Abstract]

Summary of Outstanding Time-Based and Performance-Based Stock Options

The tables below summarize the Company’s outstanding time-based stock options (in millions, except for per share amounts):

	Time-Based Options
	Number of Options	Weighted Average Exercise Price per Share		Weighted Average Remaining Contractual Term (in years)
Outstanding as of December 31, 2019	2.6	$	11.51	5.9
Exercised	(0.1)	10.04		—
Forfeited	(0.1)	13.93		—
Outstanding as of September 30, 2020	2.4	$	11.51	5.1
Exercisable as of September 30, 2020	3.7	$	11.42	5.1

The tables below summarize the Company’s outstanding performance-based stock options (in millions, except for per share amounts):

	Performance-Based Options
	Number of Options	Weighted Average Exercise Price per Share		Weighted Average Remaining Contractual Term (in years)
Outstanding as of December 31, 2019	1.4	$	11.64	5.9
Forfeited	(0.0)	12.59		—
Outstanding as of September 30, 2020	1.4	$	11.62	5.2
Exercisable as of September 30, 2020	—	—		—

Summary of Outstanding RSU's

The following table provides information about the Company’s outstanding restricted stock units ("RSUs") (in millions, except for per share amounts):

	Co-Investment RSUs			Time-Based RSUs			Performance-Based RSUs
	Number of RSUs	Weighted Average Fair Value Per Share		Number of RSUs	Weighted Average Fair Value Per Share		Number of RSUs	Weighted Average Fair Value Per Share
Unvested as of December 31, 2019	0.0	$	17.00	5.7	$	15.63	1.1	$	17.08
Granted	—	—		2.1	15.46		0.6	17.25
Vested	(0.0)	17.00		(3.3)	14.73		(0.1)	17.29
Forfeited	—	—		(0.3)	17.49		(0.1)	18.70
Unvested as of September 30, 2020	—	$	—	4.2	$	15.83	1.5	$	17.04

Summary of Compensation Expense Related to RSUs

The following table summarizes the Company's compensation expense related to RSUs (in millions):

	Three Months Ended September 30,				Nine Months Ended September 30,				Unrecognized at September 30, 2020
	2020		2019		2020		2019
Time-Based RSUs	$	8.8	$	11.4	$	31.0	$	32.5	$	50.8
Co-Investment RSUs	—		0.1		0.1		0.3		—
Performance-Based RSUs	0.7		0.6		2.8		1.3		10.4
Total RSU stock-based compensation cost	$	9.5	$	12.1	$	33.9	$	34.1	$	61.2