Stock-based Payments (Tables)

9 Months Ended

Sep. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [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, 2017	3.5		$	10.88	8.5
Granted	0.2		17.00
Exercised	(0.3	)	10.15
Forfeited	(0.1	)	11.97
Outstanding as of September 30, 2018	3.3		$	11.25	7.0
Exercisable as of September 30, 2018	1.0		$	10.57	6.8

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, 2017	1.6		$	11.23	7.8
Granted	0.1		17.00
Exercised	—		—
Forfeited	(0.2	)	11.93
Outstanding as of September 30, 2018	1.5		$	11.50	7.1
Exercisable as of September 30, 2018	—		—		—

Summary of Outstanding RSU's

The following table summarizes the Company’s outstanding 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, 2017	0.7	$	11.28	7.0		$	13.48	2.5		$	1.50
Granted	0.0	17.00		0.6		17.00		0.2		3.18
Granted through modification (modified)	—	—		0.5		17.55		(0.5	)	4.30
Vested	(0.1)	10.32		(0.9	)	11.77		—		—
Forfeited	(0.1)	11.41		(0.2	)	13.46		—		—
Unvested as of September 30, 2018	0.5	$	11.56	7.0		$	14.30	2.2		$	1.09

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, 2018
	2018		2017		2018			2017
Time-Based RSUs	$	14.5	$	5.4	$	27.3		$	17.8	$	41.6
Co-Investment RSUs	0.1		0.3		(0.1		)	1.0		0.2
Performance-Based RSUs	—		—		—			—		2.4
Equity classified compensation cost	14.6		5.7		27.2			18.8		44.2
Liability classified compensation cost (1)	0.6		1.6		3.6			4.6		—
Total RSU stock-based compensation cost	$	15.2	$	7.3	$	30.8		$	23.4	$	44.2

^{(1) In the third quarter of 2018, all liability classified awards were reclassified to equity, due to certain contingencies being lifted.}

Summary of Expense Related to DPO

The following table summarizes the Company's expense related to the DPO for those who elected to receive their consideration in shares (in millions):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Employees	$	2.7	$	2.8	$	7.5	$	8.7
Non-employees	2.5		2.7		8.4		8.2
Total DPO expense	$	5.2	$	5.5	$	15.9	$	16.9