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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2014
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, 2013
48,273

 
$
23.20

Granted
47,747

 
23.98

Vested
(48,273
)
 
23.20

Forfeited
(4,170
)
 
23.98

Nonvested at December 31, 2014
43,577

 
$
23.98
Stock Purchase Plan
Stock Purchase Plan

 
Year Ended December 31,
 
2014
 
2013
 
2012
 
(dollars in millions)
Proceeds from purchase of shares by employees
$
0.9

 
$
0.9

 
$
0.6

Number of shares issued by the Company
43,273

 
57,980

 
54,612

Recorded in share-based compensation, after the effects of DAC
$
0.2

 
$
0.3

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

 
Year Ended December 31,
 
2014
 
2013
 
2012
 
(in millions)
Share‑Based Employee Cost:
 
 
 
 
 
Recurring amortization
$
9

 
$
7

 
$
6

Accelerated amortization for retirement eligible employees
0

 
—

 
1

Subtotal
9

 
7

 
7

ESPP
0

 
0

 
0

Total Share‑Based Employee Cost
9

 
7

 
7

Total Share‑Based Directors Cost
1

 
1

 
1

Total Share‑Based Cost
10

 
8

 
8

Less: Share‑based compensation capitalized as DAC
0

 
—

 
1

Share‑based compensation expense
$
10

 
$
8

 
$
7

Income tax benefit
$
2

 
$
2

 
$
2
Stock Options [Member]  
Employee benefit plans [Line Items]  
Schedule of Stock Options
Time Vested Stock Options

 
Options for
Common Shares
 
Weighted
Average
Exercise Price
 
Weighted
Average Grant
Date Fair Value
Per Share
 
Number of
Exercisable
Options
 
Year of
Expiration
Balance as of December 31, 2013
3,129,251

 
$
20.97

 

 
2,987,088

 

Options granted
83,162

 
21.88

 
$
10.35

 

 
2021
Options exercised
(409,560
)
 
17.88

 

 

 

Options forfeited/expired
—

 
—

 

 

 

Balance as of December 31, 2014
2,802,853

 
$
21.45

 

 
2,631,653

 
Schedule of Weighted Average Assumptions on Option Pricing
Lattice Option Pricing
Weighted Average Assumptions

 
2014
 
2013
 
2012
Dividend yield
2.03
%
 
2.07
%
 
2.06
%
Expected volatility
53.24
%
 
53.41
%
 
58.89
%
Risk free interest rate
2.21
%
 
1.35
%
 
1.45
%
Expected life
6.6 years

 
6.6 years

 
6.6 years

Forfeiture rate
3.5
%
 
4.5
%
 
4.5
%
Weighted average grant date fair value
10.35

 
$
8.94

 
8.62
Performance Stock Options [Member]  
Employee benefit plans [Line Items]  
Schedule of Stock Options
Performance Stock Options

 
Options for
Common Shares
 
Weighted
Average
Exercise Price
 
Weighted
Average Grant
Date Fair Value
Per Share
 
Number of
Exercisable
Options
 
Year of
Expiration
Balance as of December 31, 2013
365,717

 
$
17.80

 

 
0

 


Options granted
—

 
—

 
$
—

 

 
—

Options exercised
—

 
—

 

 

 

Options forfeited/expired
(118,838
)
 
17.44

 

 

 

Balance as of December 31, 2014
246,879

 
$
17.97

 

 
0

 
Schedule of Weighted Average Assumptions on Option Pricing
Monte Carlo and Lattice Option Pricing
Weighted Average Assumptions (1)

 
2013
 
2012
Dividend yield
2.07
%
 
2.06
%
Expected volatility
53.5
%
 
58.89
%
Risk free interest rate
1.36
%
 
1.45
%
Expected life
6.3 years

 
6.3 years

Forfeiture rate
4.5
%
 
4.5
%
Weighted average grant date fair value
$
8.17

 
$
7.84
Restricted Stock Units [Member]  
Employee benefit plans [Line Items]  
Restricted Stock Unit Activity (Excluding Dividend Equivalents)
Restricted Stock Unit Activity
(Excluding Dividend Equivalents)

Nonvested Stock Units
 
Number of
Stock Units
 
Weighted
Average Grant
Date Fair Value
Per Share
Nonvested at December 31, 2013
736,409

 
$
17.63

Granted
238,976

 
21.61

Delivered
(284,082
)
 
17.13

Forfeited
—

 
—

Nonvested at December 31, 2014
691,303

 
$
19.23
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, 2013
223,410

 
$
27.79

Granted
203,287

 
25.17

Delivered
—

 
—

Forfeited
(3,395
)
 
27.35

Nonvested at December 31, 2014
423,302

 
$
26.72