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Stock Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Schedule of stock-based compensation expense and related income tax benefits The following table summarizes stock-based compensation costs and related income tax benefits.
 
 
Year Ended December 31,
 
 
2019
 
2018
 
2017
Stock-based compensation expense
 
$
5.6

 
$
4.0

 
$
6.4

Income tax benefit
 
(1.4
)
 
(1.0
)
 
(2.5
)
Stock-based compensation, net of income tax benefit
 
$
4.2

 
$
3.0

 
$
3.9
Schedule of total compensation costs related to the Company's equity awards and amounts recognized
The following table summarizes total compensation costs related to the Company's equity awards and amounts recognized in the year ended December 31, 2019.
 
 
Stock Options
 
Performance
Shares and RSUs
Unrecognized compensation cost — December 31, 2018
 
$
0.6

 
$
2.1

Grant date fair value current year grants
 
—

 
5.5

Compensation expense recognized
 
(0.4
)
 
(5.2
)
Unrecognized compensation cost — December 31, 2019
 
$
0.2

 
$
2.4

Expected amortization period (in years)
 
1.1

 
1.6
Schedule of stock options awarded
The following tables present information regarding stock options awarded during the years ended December 31, 2019, 2018 and 2017.
 
 
2019
 
2018
 
2017
Stock options granted
 
1,272

 
108,420

 
144,089

Per share weighted-average exercise price
 
$
66.59

 
$
93.22

 
$
82.11

Per share weighted-average grant date fair value
 
$
10.32

 
$
15.00

 
$
13.54
Schedule of assumptions used to determine the grant date fair value of options granted
The weighted-average grant date fair value for stock options granted for the years ended December 31, 2019, 2018 and 2017 was estimated using the Black-Scholes option valuation model with the following assumptions:
 
 
2019
 
2018
 
2017
Expected term in years
 
5.0

 
5.7

 
5.8

Risk free interest rate
 
1.8
%
 
2.5
%
 
2.1
%
Volatility
 
23.1
%
 
21.5
%
 
22.9
%
Dividend yield
 
3.0
%
 
3.0
%
 
3.0
%
Schedule of stock option activity under the Omnibus Plan
The following table summarizes stock option activity under the Omnibus Plan for the year ended December 31, 2019:
 
 
Number of
Stock Options
 
Weighted-Average
Exercise Price
Options outstanding — December 31, 2018
 
451,081

 
$
67.46

Add: Options granted
 
1,272

 
$
66.59

Less: Options exercised
 
34,073

 
$
35.26

Less: Options forfeited/cancelled
 
1,732

 
$
71.89

Options outstanding — December 31, 2019
 
416,548

 
$
70.08
Schedule of outstanding and exercisable stock options summarized by exercise price
The status of outstanding and exercisable stock options as of December 31, 2019, summarized by exercise price follows:
 
 
Options Vested or Expected to Vest
 
Options Exercisable
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Exercise Price
 
Number of
Options
 
Weighted-
Average
Remaining
Contractual
Life (Years)
 
Weighted-
Average
Exercise
Price
 
Aggregate
Intrinsic
Value (a)
 
Number of
Options
 
Weighted-
Average
Exercise
Price
 
Aggregate
Intrinsic
Value (a)
$13.38 — $22.44
 
8,745

 
0.8
 
$
18.72

 
$
0.4

 
8,745

 
$
18.72

 
$
0.4

$24.09 — $42.82
 
56,380

 
3.3
 
$
34.28

 
2.0

 
56,380

 
$
34.28

 
2.0

$48.19 — $74.20
 
121,703

 
5.8
 
$
58.45

 
1.5

 
120,347

 
$
58.35

 
1.5

$74.70 — $93.35
 
229,720

 
7.5
 
$
86.93

 
—

 
132,557

 
$
85.35

 
—

 
 
416,548

 
6.3
 
$
70.08

 
$
3.9

 
318,029

 
$
64.36

 
$
3.9


_______________________

(a)
Represents the total pre-tax intrinsic value as of December 31, 2019 that option holders would have received had they exercised their options as of such date. The pre-tax intrinsic value is based on the closing market price for the Company's common stock of $70.43 on December 31, 2019.
Schedule of status of the Company's unvested stock options
The following table summarizes the status of the Company's unvested stock options as of December 31, 2019 and activity for the year then ended:
 
 
Number of
Stock Options
 
Weighted-Average
Grant Date
Fair Value
Outstanding — December 31, 2018
 
210,178

 
$
14.21

Add: Options granted
 
1,272

 
$
10.32

Less: Options vested
 
111,615

 
$
14.04

Less: Options forfeited
 
1,316

 
$
13.73

Outstanding — December 31, 2019
 
98,519

 
$
14.41
Summary of activity of unvested stock-based awards
The following table summarizes the activity of the Company's unvested stock-based awards (other than stock options) for the years ended December 31, 2019, 2018 and 2017:
 
 
RSUs
 
Weighted-Average
Grant Date
Fair Value
 
PSUs
 
Weighted-Average
Grant Date
Fair Value
Outstanding — December 31, 2016
 
80,719

 
$
54.91

 
53,506

 
$
73.79

Shares granted (a)
 
10,318

 
$
76.84

 
41,883

 
$
81.85

Shares vested
 
(72,451
)
 
$
55.26

 
—

 
$
—

Performance Shares vested
 
73,838

 
$
52.11

 
(53,506
)
 
$
73.79

Shares expired or cancelled
 
(3,625
)
 
$
50.48

 
(506
)
 
$
81.85

Outstanding — December 31, 2017
 
88,799

 
$
53.33

 
41,377

 
$
81.85

Shares granted (a)
 
10,618

 
$
82.29

 
40,747

 
$
93.21

Shares vested
 
(72,190
)
 
$
60.24

 
—

 
$
—

Performance Shares vested
 
33,928

 
$
88.40

 
(31,421
)
 
$
81.85

Shares expired or cancelled
 
(7,695
)
 
$
84.45

 
(3,482
)
 
$
84.45

Outstanding — December 31, 2018
 
53,460

 
$
67.53

 
47,221

 
$
93.21

Shares granted (a)
 
46,556

 
$
67.04

 
49,730

 
$
69.05

Shares vested
 
(63,595
)
 
$
72.91

 
—

 
$
—

Performance Shares vested
 
10,354

 
$
93.21

 
(25,833
)
 
$
93.21

Shares expired or cancelled
 
(2,113
)
 
$
69.35

 
(4,927
)
 
$
85.67

Outstanding — December 31, 2019 (b)
 
44,662

 
$
65.23

 
66,191

 
$
75.62

_______________________

(a)
For the years ended December 31, 2019, 2018 and 2017, includes 43 RSUs, 132 RSUs and 226 RSUs, respectively, that were granted in lieu of cash dividends. Such dividends-in-kind vest concurrently with the underlying RSUs.
(b)
The aggregate pre-tax intrinsic value of outstanding RSUs as of December 31, 2019 was $3.1 million.