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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
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, 2019987,267 $41.24 
Granted265,564 41.31 
Vested(277,850)39.12 
Forfeited(38,532)46.39 
Nonvested at December 31, 2020936,449 $41.68 
    
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, 2019544,257 $47.23 
Granted (1)286,075 41.03 
Vested (1)(261,375)30.49 
Forfeited— — 
Nonvested at December 31, 2020 (2)568,957 $43.64 
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(1)    Includes 113,073 performance restricted stock units that were granted prior to 2020 at a weighted average grant date fair value of $30.49, but met performance hurdles and vested during 2020. The weighted average grant date fair value per share excludes these shares.
(2)    Excludes 149,960 performance restricted stock units that have met performance hurdles and will be eligible for vesting after December 31, 2020.
Schedule of Weighted Average Assumptions Used
Monte Carlo Pricing
Weighted Average Assumptions
2018
Dividend yield1.68 %
Expected volatility27.65 %
Risk free interest rate2.43 %
Weighted average grant date fair value$45.64 
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, 201948,241 $45.98 
Granted74,054 28.12 
Vested(54,197)42.04 
Forfeited— — 
Nonvested at December 31, 202068,098 $28.12 
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, 201990,351 $20.68 90,351 
Options granted— — 
Options exercised(73,971)20.42 
Options forfeited/expired(401)21.88 
Balance as of December 31, 202015,979 $21.88 15,979 
Stock Purchase Plan
Stock Purchase Plan
Year Ended December 31,
202020192018
(dollars in millions)
Proceeds from purchase of shares by employees$1.5 $1.5 $1.2 
Number of shares issued by the Company72,797 40,732 39,532 
Share-Based Compensation Expense Summary
Share-Based Compensation Expense Summary
Year Ended December 31,
202020192018
(in millions)
Share‑based compensation expense$25 $21 $19 
Share‑based compensation capitalized as DAC1.2 1.1 0.8 
Income tax benefit4 3 3