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Stock-Based Compensation Plans
 9 Months Ended
Sep. 30, 2019
Share-based Compensation [Abstract]  
Stock-Based Compensation Plans STOCK-BASED COMPENSATION PLANS

Stock-based compensation expense consists of the following:
(In millions)
 
For the Three Months Ended 
 September 30,
 
For the Nine Months Ended 
 September 30,
 
 
2019
 
2018
 
2019
 
2018
Restricted stock
 
$
0.8

 
$
0.7

 
$
2.3

 
$
2.1

Restricted stock units
 
1.2

 
2.0

 
3.4

 
5.7

Total
 
$
2.0

 
$
2.7

 
$
5.7

 
$
7.8



A summary of the non-vested restricted stock activity is presented below:
Restricted Stock
 
Number of Shares
 
Weighted Average Grant-Date Fair Value Per Share
Non-vested as of December 31, 2018
 
150,647

 
$
117.41

Granted
 
5,301

 
441.54

Vested
 
(17,971
)
 
148.14

Forfeited
 
(320
)
 
372.15

Non-vested as of September 30, 2019
 
137,657

 
$
125.29



A summary of the restricted stock unit activity is presented below:
Restricted Stock Units
 
Number of Restricted
Stock Units
 
Weighted Average Grant-Date Fair Value Per Share
Outstanding as of December 31, 2018
 
516,773

 
$
127.07

Granted
 
3,000

 
453.64

Converted
 
(87,842
)
 
106.54

Forfeited
 
(3,100
)
 
206.45

Outstanding as of September 30, 2019
 
428,831

 
$
132.99