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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2018
Employee benefit plans [Line Items]  
Restricted Stock Award Activity
Restricted Stock Award Activity

Nonvested Shares
 
Number of
Shares
 
Weighted
Average Grant
Date Fair Value
Per Share
Nonvested at December 31, 2017
50,225

 
$
37.93

Granted
51,746

 
35.56

Vested
(50,225
)
 
37.93

Forfeited
—

 
—

Nonvested at December 31, 2018
51,746

 
$
35.56
Schedule of Weighted Average Assumptions Used
Monte Carlo Pricing
Weighted Average Assumptions

 
 
2018
 
2017
 
2016
Dividend yield
 
1.68
%
 
1.37
%
 
2.12
%
Expected volatility
 
27.65
%
 
25.19
%
 
30.84
%
Risk free interest rate
 
2.43
%
 
1.48
%
 
0.90
%
Weighted average grant date fair value
 
$
45.64

 
$
53.74

 
$
25.62
Stock Purchase Plan
Stock Purchase Plan

 
Year Ended December 31,
 
2018
 
2017
 
2016
 
(dollars in millions)
Proceeds from purchase of shares by employees
$
1.2

 
$
1.0

 
$
0.9

Number of shares issued by the Company
39,532

 
33,666

 
39,055

Recorded in share-based compensation, net of deferral
$
0.3

 
$
0.3

 
$
0.2
Share-Based Compensation Expense Summary
Share‑Based Compensation Expense Summary

 
Year Ended December 31,
 
2018
 
2017
 
2016
 
(in millions)
Share‑based compensation expense
$
19

 
$
16

 
$
13

Share‑based compensation capitalized as DAC
0.8

 
0.6

 
0.4

Income tax benefit
3

 
2

 
3
Stock Options [Member]  
Employee benefit plans [Line Items]  
Schedule of Stock Options
Time Vested Stock Options

 
Options for
Common Shares
 
Weighted
Average
Exercise Price
 
Number of
Exercisable
Options
Balance as of December 31, 2017
838,954

 
$
17.41

 
838,954

Options granted
—

 
—

 
 
Options exercised
(465,326
)
 
16.32

 
 
Options forfeited/expired
—

 
—

 
 
Balance as of December 31, 2018
373,628

 
$
18.77

 
373,628
Performance Stock Options [Member]  
Employee benefit plans [Line Items]  
Schedule of Stock Options
Performance Stock Options

 
Options for
Common Shares
 
Weighted
Average
Exercise Price
 
Number of
Exercisable
Options
Balance as of December 31, 2017
190,901

 
$
17.80

 
190,901

Options granted
—

 
—

 
 
Options exercised
(163,349
)
 
17.55

 
 
Options forfeited/expired
—

 
—

 
 
Balance as of December 31, 2018
27,552

 
$
19.24

 
27,552
Restricted Stock Units (RSUs) [Member]  
Employee benefit plans [Line Items]  
Restricted Stock Unit Activity (Excluding Dividend Equivalents)

Restricted Stock Unit Activity

Nonvested Stock Units
 
Number of
Stock Units
 
Weighted
Average Grant
Date Fair Value
Per Share
Nonvested at December 31, 2017
854,619

 
$
29.67

Granted
336,690

 
37.91

Vested
(290,588
)
 
26.31

Forfeited
(445
)
 
39.29

Nonvested at December 31, 2018
900,276

 
$
33.83
Performance Restricted Stock Units [Member]  
Employee benefit plans [Line Items]  
Restricted Stock Unit Activity (Excluding Dividend Equivalents)

Performance Restricted Stock Unit Activity

Performance Restricted Stock Units
 
Number of
Performance Share Units
 
Weighted
Average Grant
Date Fair Value
Per Share
Nonvested at December 31, 2017
606,864

 
$
33.80

Granted (1)
390,570

 
45.64

Vested
(400,706
)
 
14.16

Forfeited
—

 
—

Nonvested at December 31, 2018 (2)
596,728

 
$
39.42

____________________
(1)
Includes 200,353 performance restricted stock units that were granted prior to 2018 at a weighted average grant date fair value of $14.16, but met performance hurdles and vested in February 2018.  The weighted average grant date fair value per share excludes these shares.
(2)
Excludes 226,317 performance restricted stock units that have met performance hurdles and will be eligible for vesting after December 31, 2018.