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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 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 June 30,
 
Six months ended June 30,
 
2020
 
2019
 
2020
 
2019
 
(In millions)
Stock Appreciation Rights 
$
(0.4
)
 
$
5.9

 
$
(1.9
)
 
$
7.6

Stock options
0.1

 
0.1

 
0.2

 
0.1

Restricted stock and restricted stock units, service based
1.7

 
1.5

 
3.2

 
2.7

Restricted stock and restricted stock units, performance based
3.7

 
2.5

 
5.7

 
4.7

Employee stock purchase plan
0.2

 
0.2

 
0.5

 
0.4

Total stock-based compensation expense
$
5.3

 
$
10.2

 
$
7.7

 
$
15.5