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Share-based compensation plans - Company's SARs (Details) | 12 Months Ended
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Dec. 31, 2021 $ / shares shares
Stock Appreciation Rights (SARs) |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |
Beginning Balance (in shares) | 1,271,428
Vested (in shares) | 0
Granted (in shares) | 0
Exercised (in shares) | (363,102)
Forfeited/Expired (in shares) | (28,655)
Ending Balance (in shares) | 879,671
Exercisable (in shares) | 755,507
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] |
Beginning Balance, weighted-average exercise price (usd per share) | $ / shares | $ 53.83
Granted, weighted-average exercise price (usd per share) | $ / shares | 0
Exercised, weighted-average exercise price (usd per share) | $ / shares | 50.95
Forfeited/Expired, weighted average exercise price (usd per share) | $ / shares | 53.12
Ending Balance, weighted average exercise price (usd per share) | $ / shares | 55.03
Exercisable, weighted-average exercise price (usd per share) | $ / shares | $ 54.08
Stock Appreciation Rights (SARs) | Nonvested |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |
Beginning Balance (in shares) | 397,677
Vested (in shares) | 259,687
Granted (in shares) | 0
Exercised (in shares) | 0
Forfeited/Expired (in shares) | (13,826)
Ending Balance (in shares) | 124,164
Exercisable (in shares) | 0
Stock Appreciation Rights (SARs) | Vested |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |
Beginning Balance (in shares) | 873,751
Vested (in shares) | 259,687
Granted (in shares) | 0
Exercised (in shares) | (363,102)
Forfeited/Expired (in shares) | (14,829)
Ending Balance (in shares) | 755,507
Exercisable (in shares) | 755,507
Restricted Stock Awards |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |
Granted (in shares) | 201,570
Restricted Stock Awards | Nonvested |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |
Granted (in shares) | 201,570
Restricted Stock Awards | Vested |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |
Granted (in shares) | 0

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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 -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 (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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