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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Summary of the Restricted Stock Awards and Units | The following table summarizes RSA activity and related information for 2020:
|  | Awards |  | Weighted Average Grant Date Fair Value
Nonvested at January 1, 2020 |  | 674,206 |  |  | $ | 70.19 |
Granted |  | 180,925 |  |  | $ | 95.10 |
Vested |  | (214,635) |  |  | $ | 73.65 |
Forfeited |  | (19,953) |  |  | $ | 68.86 |
Nonvested at December 31, 2020 |  | 620,543 |  |  | $ | 76.22 |
The following table summarizes cash-settled RSU activity and related information for 2020:
|  | Awards |  | Weighted Average Grant Date Fair Value
Unsettled at January 1, 2020 |  | 10,689 |  |  | $ | 53.33 |
Granted |  | 5,982 |  |  | $ | 100.26 |
Unsettled at December 31, 2020 |  | 16,671 |  |  | $ | 130.30 |
Summary of Performance Shares | The following table summarizes performance awards activity and related information for 2020:
|  | Awards |  | Weighted Average Grant Date Fair Value
Nonvested at January 1, 2020 |  | 30,555 |  |  | $ | 65.83 |
Granted |  | 20,992 |  |  | $ | 103.29 |
Forfeited |  | (6,444) |  |  | $ | 80.62 |
Nonvested at December 31, 2020 |  | 45,103 |  |  | $ | 81.15 |

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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- Definition Tabular disclosure of number and weighted-average grant date fair value for nonvested performance shares. + 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) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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