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Stock-Based Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs
The following table summarizes the Company's stock-based compensation expense included as a component of general and administrative expenses in the consolidated financial statements:
 
Year Ended December 31,
 
2019
 
2018
 
2017
 
(In millions)
Total stock-based compensation expense:
 
 
 
 
 
Equity classified awards expense
$
10.9

 
$
10.6

 
$
10.9

Liability classified awards expense (credit)
3.2

 
3.1

 
(1.0
)
Total pretax stock-based compensation expense
14.1

 
13.7

 
9.9

Book income tax benefit
(3.5
)
 
(3.5
)
 
(3.8
)
Total stock-based compensation expense, net of tax
$
10.6

 
$
10.2

 
$
6.1
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions The following summarizes the assumptions used in estimating the fair values:
 
2018
2017
Risk free interest rate
2.5
%
1.6
%
Weighted average historical volatility
34.4
%
30.0
%
Dividend yield
3.4
%
9.6
%
Expected years until exercise
3.0

3.4

Weighted average fair value of options granted
$
9.79

$
3.07

Weighted average fair value of restricted stock units granted
$
53.72

$
10.19


The Company granted 132,832 stock options during the year ended December 31, 2019 for which the fair value was estimated using a Black-Scholes option pricing model. The following table summarizes the assumptions used in the Black-Scholes model:
 
2019
 
2018
 
2017
Risk free interest rate
2.5
%
 
2.6
%
 
1.9
%
Weighted average historical volatility
30.3
%
 
26.1
%
 
22.9
%
Dividend yield
2.8
%
 
3.6
%
 
7.3
%
Expected years until exercise
4.7

 
4.6

 
4.5

Weighted average fair value of options granted
$
21.93

 
$
11.94

 
$
4.31
Schedule of Share-based Compensation, Stock Options, Activity
Stock option activity for the years ended December 31, 2019, 2018 and 2017 is summarized as follows:
 
Number of
Shares Under Option
 
Weighted Average
Exercise Price
Per Share
 
Weighted Average
Remaining Contractual
Term (in Years)
 
Aggregate Intrinsic
Value (in Millions)
Outstanding at December 31, 2016
701,134

 
$
80.04

 
 
 
 

Granted
887,030

 
48.35

 
 
 
 

Exercised
(64,916
)
 
40.59

 
 
 
 

Forfeited
(171,847
)
 
65.82

 
 
 
 

Expired
(79,353
)
 
87.02

 
 
 
 

Outstanding at December 31, 2017
1,272,048

 
61.44

 
 
 
 

Granted
248,899

 
69.12

 
 
 
 

Exercised
(74,930
)
 
52.43

 
 
 
 

Forfeited
(6,309
)
 
68.80

 
 
 
 

Outstanding at December 31, 2018
1,439,708

 
63.21

 
 
 
 

Granted
132,832

 
98.97

 
 
 
 

Exercised
(211,352
)
 
57.36

 
 
 
 

Forfeited
(106,745
)
 
72.19

 
 
 
 

Expired
(37,005
)
 
93.06

 
 
 
 

Outstanding at December 31, 2019
1,217,438

 
$
66.43

 
5.7
 
$
24.1

Vested and Expected to Vest at December 31, 2019
1,146,329

 
$
67.06

 
5.6
 
$
22.0

Exercisable at December 31, 2019
561,872

 
$
77.80

 
3.1
 
$
5.9
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity
Activity in equity classified awards of restricted stock and restricted stock units for the years ended December 31, 2019, 2018 and 2017 is as follows:
 

Shares of Restricted Stock
 
Weighted
Average
Grant-Date Per
Share
Fair Value
 
Restricted
Stock Units
 
Weighted
Average
Grant-Date
Per Share
Fair Value
Outstanding at December 31, 2016
235,472

 
$
92.91

 
34,058

 
$
93.95

Granted
216,269

 
51.89

 
281,973

 
22.37

Released
(92,968
)
 
88.62

 
(12,683
)
 
81.63

Forfeited
(83,582
)
 
79.52

 
—

 
—

Outstanding at December 31, 2017
275,191

 
65.97

 
303,348

 
28.39

Granted
92,466

 
69.20

 
86,990

 
57.21

Released
(74,253
)
 
81.07

 
(15,737
)
 
98.54

Forfeited
(26,162
)
 
61.27

 
(72
)
 
53.49

Outstanding at December 31, 2018
267,242

 
64.21

 
374,529

 
31.05

Granted
75,556

 
96.86

 
23,427

 
95.77

Released
(76,962
)
 
76.25

 
(12,347
)
 
90.34

Forfeited
(41,321
)
 
67.20

 
(27,802
)
 
34.53

Outstanding at December 31, 2019
224,515

 
$
70.52

 
357,807

 
$
30.35
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award
The Company has granted cash-settled restricted stock units to certain employees. These instruments are recorded as liabilities at fair value as of the respective period end.
 
 
Cash-Settled Restricted
Stock Units
 
Weighted
Average
Grant Date
Fair Value
Outstanding at December 31, 2018
 
53,766

 
$
79.07

Granted
 
20,989

 
83.58

Released
 
(462
)
 
83.18

Forfeited
 
(10,441
)
 
88.70

Outstanding at December 31, 2019
 
63,852

 
$
85.63