XML 32 R24.htm IDEA: XBRL DOCUMENT v3.20.1
Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2020
Share-based Payment Arrangement [Abstract]  
Summary of Stock-Based Compensation Expense by Type of Award
The following table summarizes stock-based compensation expense by type of award:
 
Three months ended March 31,
 
2020
 
2019
 
(In millions)
Stock Appreciation Rights 
$
(1.5
)
 
$
1.7

Stock options
0.1

 
—

Restricted stock and restricted stock units, service based
1.5

 
1.2

Restricted stock and restricted stock units, performance based
2.0

 
2.2

Employee stock purchase plan
0.3

 
0.2

Total stock-based compensation expense
$
2.4

 
$
5.3