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Stock-based Payments (Tables)
3 Months Ended
Mar. 31, 2019
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, 2018
3.3

 
$
11.23

 
6.8
Exercised
(0.3
)
 
10.00

 
 
Forfeited

 
14.08

 
 
Outstanding as of March 31, 2019
3.0

 
$
11.32

 
6.6
Exercisable as of March 31, 2019
1.9

 
$
10.58

 
6.5
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, 2018
1.5

 
$
11.48

 
6.9

Forfeited

 
13.85

 
 
Outstanding as of March 31, 2019
1.5

 
$
11.47

 
6.6

Exercisable as of March 31, 2019

 

 

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, 2018
0.6

 
$
11.50

 
7.8

 
$
14.63

 
0.7

 
$
15.94

Granted

 

 
1.8

 
17.85

 
0.4

 
19.64

Vested
(0.0)

 
17.00

 
(0.2
)
 
13.21

 

 

Forfeited

 

 
(0.1
)
 
12.51

 

 

Unvested as of March 31, 2019
0.6

 
$
11.38

 
9.3

 
$
15.32

 
1.1

 
$
17.08

Summary of Compensation Expense Related to RSUs
The following table summarizes the Company's compensation expense related to RSUs (in millions):
 
Three Months Ended March 31,
 
Unrecognized at March 31, 2019
2019
2018
 
Time-Based RSUs
$
9.7

$
5.1

 
$
87.5

Co-Investment RSUs
0.1

0.3

 
0.4

Performance-Based RSUs
0.2


 
6.6

Equity classified compensation cost
10.0

5.4

 
94.5

Liability classified compensation cost(1)

2.0

 

Total RSU stock-based compensation cost
$
10.0

$
7.4

 
$
94.5


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