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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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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 |

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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 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=116856206&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=116856206&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=116856206&loc=d3e5070-113901 + Details
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