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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2019
Share-based Payment Arrangement [Abstract]  
Stock-based compensation expense
The following table summarizes our stock-based compensation expense for the three and nine months ended September 30, 2019 and 2018.
 
 
Three Months Ended
 
Nine Months Ended
 
 
September 30,
 
September 30,
(in millions)
 
2019
 
2018
 
2019
 
2018
Stock-based compensation expenses (restricted share units (“RSUs”) and performance-based RSUs (“PRSUs”)), before income taxes
 
$
5.6

 
$
4.8

 
$
16.4

 
$
15.4

Tax benefit
 
(0.4
)
 
(0.4
)
 
(1.1
)
 
(1.1
)
Stock-based compensation expense, net of tax
 
$
5.2

 
$
4.4

 
$
15.3

 
$
14.3
Activity of RSUs and PRSUs Issued to Our Employees
The following table summarizes activity for the nine months ended September 30, 2019, of RSUs and PRSUs issued to our employees.
 
 
Activity
 
Weighted Average Per Share Grant Date Fair Market Value
Non-vested as of December 31, 2018
 
1,723,980

 
$
22.39

Granted:
 
 
 
 
RSUs
 
853,965

 
21.73

PRSUs
 
376,418

 
21.41

Vested:
 
 
 
 
RSUs
 
(586,553
)
 
21.99

PRSUs
 
(246,542
)
 
21.99

Forfeitures:
 
 
 
 
RSUs
 
(42,425
)
 
22.16

PRSUs
 
(5,250
)
 
22.17

Non-vested as of September 30, 2019
 
2,073,593

 
22.10
Activity of Stock Options Issued to Our Employees
The following table summarizes activity for the nine months ended September 30, 2019, of stock options issued to our employees.
 
 
Activity
 
Weighted Average Exercise Price
Outstanding as of December 31, 2018
 
141,847

 
$
23.08

Exercised
 
(15,319
)
 
10.78

Outstanding as of September 30, 2019
 
126,528

 
24.57

 
 
 
 
 
Exercisable as of September 30, 2019
 
126,528

 
24.57