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Stock-Based Compensation Plans (Tables) | 9 Months Ended
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Sep. 30, 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 as of December 31, 2018 | 4,864,836 |  |  | $ | 17.76 |  |  |  |  |
Exercised | (419,928 | ) |  | 15.90 |  |  |  |  |
Forfeited | (3,496 | ) |  | 17.89 |  |  |  |  |
Outstanding as of September 30, 2019 | 4,441,412 |  |  | $ | 17.93 |  |  | 5.52 |  | $ | 59,471,161 |
Exercisable as of September 30, 2019 | 3,897,260 |  |  | $ | 17.61 |  |  | 5.29 |  | $ | 53,440,113 |
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 nine months ended September 30, 2018, were estimated on the date of grant using the Black-Scholes option-pricing model, acceptable under ASC 718, Compensation – Stock Compensation (“ASC 718”), with the following weighted average assumptions:
| Nine Months Ended September 30, 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 nonvested long-term incentive program performance share awards (“LTIP performance shares”) is as follows:
| Number of Shares at Expected Attainment |  | Weighted Average Grant Date Fair Value
Nonvested as of December 31, 2018 | 540,697 |  |  | $ | 19.83 |
Forfeited | (23,029 | ) |  | 20.12 |
Change in attainment | 377,557 |  |  | 20.22 |
Nonvested as of September 30, 2019 | 895,225 |  |  | $ | 19.99 |
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 restricted share awards (“RSAs”) is as follows:
| Number of Shares |  | Weighted Average Grant Date Fair Value
Nonvested as of December 31, 2018 | 213,337 |  |  | $ | 20.21 |
Vested | (106,610 | ) |  | 20.17 |
Forfeited | (10,934 | ) |  | 20.12 |
Nonvested as of September 30, 2019 | 95,793 |  |  | $ | 20.21 |
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 total shareholder return awards (“TSRs”) is as follows:
| Number of Shares |  | Weighted Average Grant Date Fair Value
Nonvested as of December 31, 2018 | 718,931 |  |  | $ | 29.25 |
Granted | 436,674 |  |  | 47.90 |
Forfeited | (27,567 | ) |  | 37.22 |
Nonvested as of September 30, 2019 | 1,128,038 |  |  | $ | 36.27 |
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 nine months ended September 30, 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:
| Nine Months Ended September 30,
| 2019 |  | 2018
Expected life (years) | 2.8 |  |  | 2.9 |
Risk-free interest rate | 2.5 | % |  | 2.4 | %
Expected volatility | 29.3 | % |  | 28.0 | %
Expected dividend yield | — |  |  | — |
Restricted Share Units (RSUs) |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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, 2018 | 651,045 |  |  | $ | 23.82 |
Granted | 687,302 |  |  | 33.05 |
Vested | (259,634 | ) |  | 24.16 |
Forfeited | (36,588 | ) |  | 27.94 |
Nonvested as of September 30, 2019 | 1,042,125 |  |  | $ | 29.68 |

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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=116856206&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=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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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options 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 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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