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Stock-Based Compensation Plans (Tables) | 9 Months Ended
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Sep. 30, 2021
Share-based Payment Arrangement [Abstract] |
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 as of December 31, 2020 | 2,186,511 |  |  | $ | 17.87 |  |  |  |  |
Exercised | (380,676) |  |  | 19.05 |  |  |  |  |
Outstanding as of September 30, 2021 | 1,805,835 |  |  | $ | 17.63 |  |  | 3.27 |  | $ | 23,662,370 |
Exercisable as of September 30, 2021 | 1,805,835 |  |  | $ | 17.63 |  |  | 3.27 |  | $ | 23,662,370 |
Summary of Nonvested Performance Award Activity | A summary of nonvested total shareholder return awards ("TSRs") is as follows:
| Number of Shares |  | Weighted Average Grant Date Fair Value
Nonvested as of December 31, 2020 | 1,367,728 |  |  | $ | 34.59 |
Granted | 367,317 |  |  | 50.60 |
Vested | (782,588) |  |  | 31.31 |
Forfeited | (153,681) |  |  | 38.57 |
Change in payout rate | 391,294 |  |  | 31.31 |
Nonvested as of September 30, 2021 | 1,190,070 |  |  | $ | 40.10 |
Summary of Grant Date Fair Value Weighted-Average Assumptions, Awards Other Than Options | The fair value of TSRs granted during the nine months ended September 30, 2021 and 2020, were estimated on the date of grant using the Monte Carlo simulation model, acceptable under ASC 718, Compensation - Stock Compensation, using the following weighted average assumptions:
| Nine Months Ended September 30,
| 2021 |  | 2020
Expected life (years) | 2.8 |  | 2.8
Risk-free interest rate | 0.3 | % |  | 0.5 | %
Expected volatility | 41.2 | % |  | 31.4 | %
Expected dividend yield | — |  |  | — |
Summary of Nonvested Restricted Share Unit Activity | A summary of nonvested restricted share unit awards ("RSUs") is as follows:
| Number of Shares |  | Weighted Average Grant Date Fair Value
Nonvested as of December 31, 2020 | 1,118,182 |  |  | $ | 27.34 |
Granted | 578,220 |  |  | 39.27 |
Vested | (522,608) |  |  | 27.69 |
Forfeited | (232,734) |  |  | 30.54 |
Nonvested as of September 30, 2021 | 941,060 |  |  | $ | 33.69 |

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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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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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