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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
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, 2019 |  | 4,006,816 |  |  | $ | 18.18 |  |  |  |  |
Exercised |  | (1,756,471) |  |  | 18.53 |  |  |  |  |
Forfeited |  | (57,744) |  |  | 19.08 |  |  |  |  |
Expired |  | (6,090) |  |  | 18.44 |  |  |  |  |
Outstanding, December 31, 2020 |  | 2,186,511 |  |  | $ | 17.87 |  |  | 3.96 |  | $ | 44,944,958 |
Exercisable, December 31, 2020 |  | 2,039,275 |  |  | $ | 17.72 |  |  | 4.16 |  | $ | 42,231,530 |
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 during the year ended December 31, 2018, were estimated on the date of grant using the Black-Scholes option-pricing model, acceptable under ASC 718, with the following weighted average assumptions:
| Year Ended December 31, 2018 |  |  |  |
Expected life (years) | 5.6 |  |  |  |
Risk-free interest rate | 2.7 | % |  |  |  |
Expected volatility | 26.4 | % |  |  |  |
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, 2019 |  | 669,469 |  |  | $ | 20.12 |
Vested |  | (668,240) |  |  | 20.12 |
Forfeited |  | (5,368) |  |  | 20.12 |
Change in expected attainment |  | 4,139 |  |  | 20.12 |
Nonvested at December 31, 2020 |  | — |  |  | $ | — |
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, 2019 |  | 92,842 |  |  | $ | 20.13 |
Vested |  | (88,913) |  |  | 20.12 |
Forfeited |  | (3,929) |  |  | 20.35 |
Nonvested at December 31, 2020 |  | — |  |  | $ | — |
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 |  | Weighted Average Grant Date Fair Value
Nonvested as of December 31, 2019 |  | 1,062,291 |  |  | $ | 35.77 |
Granted |  | 677,195 |  |  | 30.01 |
Vested |  | (199,413) |  |  | 24.37 |
Forfeited |  | (158,086) |  |  | 36.69 |
Change in payout rate |  | (14,259) |  |  | 24.37 |
Nonvested as of December 31, 2020 |  | 1,367,728 |  |  | $ | 34.59 |
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 fair value of TSRs granted during the years ended December 31, 2020, 2019, and 2018, were estimated on the date of grant using the Monte Carlo simulation model, acceptable under ASC 718, using the following weighted-average assumptions:
| Years Ended December 31,
| 2020 |  | 2019 |  | 2018
Expected life (years) | 2.8 |  | 2.8 |  | 2.9
Risk-free interest rate | 0.5 | % |  | 2.5 | % |  | 2.4 | %
Volatility | 31.4 | % |  | 29.3 | % |  | 28.0 | %
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, 2019 |  | 1,009,404 |  |  | $ | 29.96 |
Granted |  | 816,543 |  |  | 25.72 |
Vested |  | (431,504) |  |  | 29.60 |
Forfeited |  | (276,261) |  |  | 28.57 |
Nonvested as of December 31, 2020 |  | 1,118,182 |  |  | $ | 27.34 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of awards other than stock options, including, but not limited to: (a) expected term of share awards and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References No definition available. + Details
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