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Stock-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Stock Option Activity
A summary of stock option activity is as follows:
 
 
Number of
Shares
 
Weighted Average
Exercise Price ($)
 
Weighted Average
Remaining Contractual
Term (Years)
 
Aggregate Intrinsic Value
of In-the-Money
Options ($)
Outstanding, December 31, 2018
 
4,864,836

 
$
17.76

 
 
 
 
Exercised
 
(854,524
)
 
15.78

 
 
 
 
Forfeited
 
(3,496
)
 
17.89

 
 
 
 
Outstanding, December 31, 2019
 
4,006,816

 
$
18.18

 
3.71
 
$
78,949,941

Exercisable, December 31, 2019
 
3,462,664

 
$
17.86

 
3.70
 
$
69,349,255
Black-Scholes Option-Pricing Model  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Grant Date Fair Value Weighted Average Assumptions, Options
The fair value of options granted in the respective fiscal years are estimated on the date of grant using the Black-Scholes option-pricing model, acceptable under ASC 718, with the following weighted average assumptions:
 
Years Ended December 31,
 
2018
 
2017
Expected life (years)
5.6

 
5.6

Risk-free interest rate
2.7
%
 
1.9
%
Expected volatility
26.4
%
 
29.4
%
Expected dividend yield
—

 
—
LTIP Performance Shares  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Nonvested Performance Award Activity
A summary of the nonvested LTIP performance shares is as follows:
 
 
Number of Shares at
Expected Attainment
 
Weighted Average
Grant Date Fair Value
Nonvested at December 31, 2018
 
540,697

 
$
19.83

Forfeited
 
(56,567
)
 
18.80

Change in expected attainment
 
185,339

 
20.09

Nonvested at December 31, 2019
 
669,469

 
$
20.12
Restricted Share Awards (RSAs)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Nonvested Restricted Share Award Activity
A summary of nonvested RSAs is as follows:
 
 
Number of
Shares
 
Weighted Average
Grant Date Fair Value
Nonvested at December 31, 2018
 
213,337

 
$
20.21

Vested
 
(106,610
)
 
20.17

Forfeited
 
(13,885
)
 
20.64

Nonvested at December 31, 2019
 
92,842

 
$
20.13
Total Shareholder Return Awards (TSRs)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Nonvested Performance Award Activity
A summary of nonvested TSRs is as follows:
 
 
Number of Shares at
Expected Attainment
 
Weighted Average
Grant Date Fair Value
Nonvested as of December 31, 2018
 
718,931

 
$
29.25

Granted
 
436,674

 
47.90

Forfeited
 
(93,314
)
 
35.37

Nonvested as of December 31, 2019
 
1,062,291

 
$
35.77
Total Shareholder Return Awards (TSRs) | Monte Carlo Simulation Model  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Grant Date Fair Value Weighted Average Assumptions, Awards Other Than Options

The grant date fair value of the TSRs was estimated using the following weighted-average assumptions:
 
Years Ended December 31,
 
2019
 
2018
 
2017
Expected life (years)
2.8

 
2.9

 
2.9

Interest rate
2.5
%
 
2.4
%
 
1.5
%
Volatility
29.3
%
 
28.0
%
 
26.5
%
Expected dividend yield
—

 
—

 
—
Restricted Stock Units (RSUs)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Nonvested Restricted Share Unit Activity
A summary of nonvested RSUs is as follows:
 
 
Number of
Shares
 
Weighted Average
Grant Date Fair Value
Nonvested as of December 31, 2018
 
651,045

 
$
23.82

Granted
 
742,579

 
33.28

Vested
 
(259,634
)
 
24.16

Forfeited
 
(124,586
)
 
29.79

Nonvested as of December 31, 2019
 
1,009,404

 
$
29.96