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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Stock-based compensation expense
The following table summarizes our stock-based compensation expense for 2019, 2018 and 2017.
 
 
Year Ended December 31,
(in millions)
 
2019
 
2018
 
2017
RSUs and PRSUs
 
$
22.3

 
$
20.2

 
$
20.3

Stock options
 
—

 
—

 
0.2

Stock-based compensation expense, before income taxes
 
22.3

 
20.2

 
20.5

Tax benefit
 
(1.5
)
 
(1.3
)
 
(2.0
)
Stock-based compensation expense, net of tax
 
$
20.8

 
$
18.9

 
$
18.5
Activity of RSUs and PRSUs issued to our employees
The following table summarizes the 2019 activity of the 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
 
(602,181
)
 
22.05

PRSUs
 
(246,542
)
 
21.99

Forfeitures:
 
 
 
 
RSUs
 
(69,122
)
 
22.00

PRSUs
 
(11,750
)
 
21.77

Non-vested as of December 31, 2019
 
2,024,768

 
22.09
Activity of stock options issued to our employees
The following table summarizes the activity 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 December 31, 2019
 
126,528

 
24.57

 
 
 
 
 
Exercisable as of December 31, 2019
 
126,528

 
24.57
Cash proceeds received and tax benefit from stock option exercises
The following table summarizes other information relating to stock option exercises.
 
 
Year Ended December 31,
(in millions)
 
2019
 
2018
 
2017
Tax benefit of stock option exercises
 
$
—

 
$
—

 
$
0.1

Intrinsic value of stock option exercises
 
0.1

 
0.4

 
2.1
Stock options outstanding and exercisable by price
The following table summarizes information concerning outstanding and exercisable stock options to purchase our common stock under the Stock Plan as of December 31, 2019.
 
 
Outstanding
 
Exercisable
Range of
Exercise Price
 
Number
of
Options
 
Remaining
Contractual
Life (Years)
 
Weighted
Average
Exercise
Price
 
Number of
Options
 
Weighted
Average
Exercise
Price
$10 to 14.99
 
13,169

 
0.15
 
$
13.68

 
13,169

 
$
13.68

$20 to 24.99
 
9,946

 
1.12
 
20.07

 
9,946

 
20.07

$25 to 29.99
 
103,413

 
1.72
 
26.39

 
103,413

 
26.39

 
 
126,528

 
 
 
 
 
126,528