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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2019
Share-based Payment Arrangement [Abstract]  
Stock-based compensation expense
The following table summarizes our stock-based compensation expense for the three and six months ended June 30, 2019 and 2018.
 
 
Three Months Ended
 
Six Months Ended
 
 
June 30,
 
June 30,
(in millions)
 
2019
 
2018
 
2019
 
2018
Stock-based compensation expenses (restricted share units (“RSUs”) and performance-based RSUs (“PRSUs”)), before income taxes
 
$
5.5

 
$
5.6

 
$
10.8

 
$
10.6

Tax benefit
 
(0.4
)
 
(0.4
)
 
(0.7
)
 
(0.7
)
Stock-based compensation expense, net of tax
 
$
5.1

 
$
5.2

 
$
10.1

 
$
9.9
Activity of RSUs and PRSUs Issued to Our Employees
The following table summarizes activity for the six months ended June 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
 
828,274

 
21.57

PRSUs
 
376,418

 
21.41

Vested:
 
 
 
 
RSUs
 
(584,870
)
 
21.99

PRSUs
 
(246,542
)
 
21.99

Forfeitures:
 
 
 
 
RSUs
 
(31,009
)
 
22.23

PRSUs
 
(5,250
)
 
22.17

Non-vested as of June 30, 2019
 
2,061,001

 
22.05
Activity of Stock Options Issued to Our Employees
The following table summarizes activity for the six months ended June 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 June 30, 2019
 
126,528

 
24.57

 
 
 
 
 
Exercisable as of June 30, 2019
 
126,528

 
24.57