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Share-based compensation plans (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-based Payment Arrangement [Abstract] |
Activity related to restricted stock units | The activity related to restricted stock units for the year ended December 31, 2021 is as follows:
| Nonvested |  | Vested |  | Total |  | Average Grant Date Fair Value Per Share
Outstanding, December 31, 2020 | 209,583 |  |  | 75,863 |  |  | 285,446 |  |  | $ | 50.19 |
Granted | 201,570 |  |  | — |  |  | 201,570 |  |  | $ | 57.77 |
Vested | (68,231) |  |  | 68,231 |  |  | — |  |  |
Converted | — |  |  | (64,093) |  |  | (64,093) |  |  | $ | 53.28 |
Cancelled | (12,053) |  |  | — |  |  | (12,053) |  |  | $ | 55.98 |
Dividend equivalents | 1,728 |  |  | 2,263 |  |  | 3,991 |  |  | $ | 62.95 |
Outstanding, December 31, 2021 | 332,597 |  |  | 82,264 |  |  | 414,861 |  |  | $ | 53.32 |
Activity related to performance contingent restricted stock units | The activity related to performance contingent restricted stock units for the year ended December 31, 2021 is as follows:
| Nonvested |  | Vested |  | Total |  | Average Grant Date Fair Value per Share
Outstanding, December 31, 2020 | 157,122 |  |  | 166,432 |  |  | 323,554 |  |  | $49.15
Granted | 145,696 |  |  | — |  |  | 145,696 |  |  | $55.95
Performance adjustments | 256,711 |  |  | — |  |  | 256,711 |  |  | $54.28
Vested | (64,243) |  |  | 64,243 |  |  | — |  |  |
Converted | — |  |  | (133,960) |  |  | (133,960) |  |  | $46.34
Cancelled | (14,633) |  |  | — |  |  | (14,633) |  |  | $54.79
Dividend equivalents | — |  |  | 938 |  |  | 938 |  |  | $62.95
Outstanding, December 31, 2021 | 480,653 |  |  | 97,653 |  |  | 578,306 |  |  | $53.67
Estimated fair values of all SARs applying assumptions | The Company computed the estimated fair values of all SARs granted during 2019 using the Black-Scholes option-pricing model applying the assumptions set forth in the following table:
| 2019
Expected dividend yield | 2.7 | %
Expected stock price volatility | 16.6 | %
Risk-free interest rate | 2.6 | %
Expected life of SARs | 6 years
Company's SARs | The activity related to the Company’s SARs for the year ended December 31, 2021 is as follows:
| Nonvested |  | Vested |  | Total |  | Weighted- average Exercise Price
Outstanding, December 31, 2020 | 397,677 |  |  | 873,751 |  |  | 1,271,428 |  |  | $ | 53.83 |
Vested | (259,687) |  |  | 259,687 |  |  | — |  |  |
Granted | — |  |  | — |  |  | — |  |  | $ | — |
Exercised | — |  |  | (363,102) |  |  | (363,102) |  |  | $ | 50.95 |
Forfeited/Expired | (13,826) |  |  | (14,829) |  |  | (28,655) |  |  | $ | 53.12 |
Outstanding, December 31, 2021 | 124,164 |  |  | 755,507 |  |  | 879,671 |  |  | $ | 55.03 |
Exercisable, December 31, 2021 | — |  |  | 755,507 |  |  | 755,507 |  |  | $ | 54.08 |
Schedule of other share-based compensation, activity | The activity related to deferred compensation for equity award units granted to both employees and non-employee directors combined is as follows:
| Total
Outstanding, December 31, 2020 | 372,413 |
Deferred | 38,127 |
Converted | (40,527) |
Dividend equivalents | 10,744 |
Outstanding, December 31, 2021 | 380,757 |

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- Definition Tabular disclosure of share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of activity for outstanding award under share-based payment arrangement excluding share and unit options and nonvested award. + 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 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=120381028&loc=d3e5070-113901 + Details
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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=120381028&loc=d3e5070-113901 + Details
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