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Stock-Based Compensation Plans
 3 Months Ended
Mar. 31, 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 
 March 31,
 
 
2019
 
2018
Restricted stock
 
$
0.8

 
$
0.7

Restricted stock units
 
1.4

 
2.4

Total
 
$
2.2

 
$
3.1



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
 
(19
)
 
350.41

Non-vested as of March 31, 2019
 
137,958

 
$
125.83



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
 
1,500

 
436.41

Converted
 
(87,842
)
 
106.54

Outstanding as of March 31, 2019
 
430,431

 
$
132.34