v3.10.0.1
Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of stock-based compensation grant and expense activity
The following table summarizes our stock-based compensation grant and expense activity for the six months ended June 30, 2018:
 
Number of
Shares Granted
(in thousands)
 
Compensation
Expense
 (in millions)
 
Restricted stock units
440.5

 
$
13.3

 
Performance shares
329.3

 
8.8

 
Total
769.8

 
$
22.1