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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Share-based compensation arrangements, vested stock grants
The following is a summary of Company authorized vested stock grants to certain directors for the year ended December 31, 2019, 2018 and 2017. Stock-based compensation expense related to vested stock grants are included in General and administrative expenses within the Consolidated Statements of Income.
 
Year Ended December 31,
(millions, except stock grants)
2019
 
2018
 
2017
Vested stock grants
14,076

 
12,736

 
16,428

Stock-based compensation expense
$
0.5

 
$
0.5

 
$
0.5
Summary of the status of the restricted stock units and changes during the period
A summary of the status of the restricted stock units as of December 31, 2019, and changes during the years ended December 31, 2019, 2018 and 2017, are presented below:
 
Shares
 
Weighted
Average
Grant-Date
Fair Value
Nonvested as of December 31, 2016
334,197

 
$
19.45

Issued
22,000

 
18.25

Vested
(26,399
)
 
18.98

Forfeited
(4,537
)
 
21.92

Nonvested as of December 31, 2017
325,261

 
$
19.37

Issued
57,089

 
35.28

Vested
(173,240
)
 
19.67

Forfeited
(6,456
)
 
21.57

Nonvested as of December 31, 2018
202,654

 
$
23.53

Issued
37,235

 
33.61

Vested
(78,469
)
 
19.41

Forfeited
(7,978
)
 
35.35

Nonvested as of December 31, 2019
153,442

 
$
27.46
Summary of compensation expense related to restricted stock units
The table below shows the Company's stock-based compensation expense related to the restricted stock units for the years ended December 31, 2019, 2018 and 2017, and is included in General and administrative expenses within the Consolidated Statements of Income.
 
Year Ended December 31,
(millions)
2019
 
2018
 
2017
Stock-based compensation expense
$
1.1

 
$
0.9

 
$
0.9


The table below shows the Company's stock-based compensation expense related to the Performance-Based Incentive Program for the years ended December 31, 2019, 2018 and 2017, which is included in General and administrative expenses within the Consolidated Statements of Income.

Year Ended December 31,
(millions)
2019
 
2018
 
2017
Stock-based compensation expense
$
3.3

 
$
1.4

 
$
1.3
Summary of unrecognized compensation expense related to share based payment
Unrecognized stock-based compensation expense related to the restricted stock units and the respective weighted average periods in which the expense will be recognized for the years ended December 31, 2019, 2018 and 2017, is shown in the table below.
 
Year Ended December 31,
(millions)
2019
 
2018
 
2017
Unrecognized stock-based compensation
$
1.7

 
$
1.8

 
$
0.9

Weighted average (years)
1.8 years

 
2.3 years

 
2.1 years
Summary of the status of the performance stock units and changes during the period
A summary of the status of the performance share units as of December 31, 2019, and changes during the years ended December 31, 2019, 2018 and 2017 are presented below:
 
Shares
 
Weighted
Average
Grant-Date
Fair Value
Nonvested as of December 31, 2016
159,477

 
$
22.99

Issued (1)
29,494

 
29.51

Vested
(61,919
)
 
22.63

Forfeited
(11,770
)
 
25.86

Nonvested as of December 31, 2017
115,282

 
28.01

Issued (2)
55,640

 
36.49

Vested
(66,657
)
 
25.42

Forfeited
(10,572
)
 
29.70

Nonvested as of December 31, 2018
93,693

 
35.92

Issued (3)
173,594

 
33.80

Vested
(43,845
)
 
33.15

Forfeited
(11,819
)
 
35.13

Nonvested as of December 31, 2019
211,623

 
$
34.62


(1) Includes a reduction of 59,091 shares of performance adjustments made at a weighted average grant-date fair value of $26.07.
(2) Includes a reduction of 45,075 shares of performance adjustments made at a weighted average grant-date fair value of $35.86.
(3) Includes an increase of 48,632 shares of performance adjustments made at a weighted average grant-date fair value of $36.05.