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Share-based Payments (Summary of Share Unit Activity) (Details) - $ / shares | 1 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
PSUs | Equity-classified awards |  |  |  |
Common shares issued |  |  |  |
Outstanding beginning balance (in shares) |  | 662,634 | 523,618 | 542,676
Granted (in shares) |  | 94,729 | 236,855 | 160,713
Assumed in IAA acquisition (in shares) | 159,475 | 0 |  |
Vested and settled (in shares) |  | (283,086) | (93,241) | (161,248)
Forfeited (in shares) |  | (58,848) | (4,598) | (18,523)
Outstanding ending balance (in shares) |  | 415,429 | 662,634 | 523,618
Fair Value of common shares |  |  |  |
Outstanding beginning balance, Weighted average grant date fair value (usd per share) |  | $ 51.71 | $ 45.90 | $ 38.09
Granted, Weighted average grant date fair value (usd per share) |  | 58.04 | 58.53 | 57.67
Assumed in IAA acquisition, Weighted average grant date fair value (per share) |  | 0 |  |
Vested and settled, Weighted average grant date fair value (usd per share) |  | 42.23 | 36.42 | 31.14
Forfeited, Weighted average grant date fair value (usd per share) |  | 60.62 | 51.76 | 47.58
Outstanding ending balance, Weighted average grant date fair value (usd per share) |  | $ 58.35 | $ 51.71 | $ 45.90
PSUs with Market Conditions | Equity-classified awards |  |  |  |
Common shares issued |  |  |  |
Outstanding beginning balance (in shares) |  | 102,879 | 88,305 | 0
Granted (in shares) |  | 80,398 | 14,574 | 88,305
Assumed in IAA acquisition (in shares) |  | 0 |  |
Vested and settled (in shares) |  | 0 | 0 | 0
Forfeited (in shares) |  | (9,017) | 0 | 0
Outstanding ending balance (in shares) |  | 174,260 | 102,879 | 88,305
Fair Value of common shares |  |  |  |
Outstanding beginning balance, Weighted average grant date fair value (usd per share) |  | $ 66.08 | $ 65.45 | $ 0
Granted, Weighted average grant date fair value (usd per share) |  | 85.33 | 69.92 | 65.45
Assumed in IAA acquisition, Weighted average grant date fair value (per share) |  | 0 |  |
Vested and settled, Weighted average grant date fair value (usd per share) |  | 0 | 0 | 0
Forfeited, Weighted average grant date fair value (usd per share) |  | 68.59 | 0 | 0
Outstanding ending balance, Weighted average grant date fair value (usd per share) |  | $ 74.83 | $ 66.08 | $ 65.45
RSUs | Equity-classified awards |  |  |  |
Common shares issued |  |  |  |
Outstanding beginning balance (in shares) |  | 68,024 | 79,112 | 134,937
Granted (in shares) |  | 425,309 | 34,495 | 46,675
Assumed in IAA acquisition (in shares) |  | 366,379 |  |
Vested and settled (in shares) |  | (309,102) | (37,714) | (93,426)
Forfeited (in shares) |  | (10,939) | (7,869) | (9,074)
Outstanding ending balance (in shares) |  | 539,671 | 68,024 | 79,112
Fair Value of common shares |  |  |  |
Outstanding beginning balance, Weighted average grant date fair value (usd per share) |  | $ 58.32 | $ 54.96 | $ 39.14
Granted, Weighted average grant date fair value (usd per share) |  | 53.35 | 57.71 | 60.98
Assumed in IAA acquisition, Weighted average grant date fair value (per share) |  | 52.79 |  |
Vested and settled, Weighted average grant date fair value (usd per share) |  | 53.22 | 50.29 | 35.04
Forfeited, Weighted average grant date fair value (usd per share) |  | 55.06 | 60.30 | 55.81
Outstanding ending balance, Weighted average grant date fair value (usd per share) |  | $ 53.64 | $ 58.32 | $ 54.96
DSUs | Liability-classified awards |  |  |  |
Common shares issued |  |  |  |
Outstanding beginning balance (in shares) |  | 108,365 | 156,589 | 137,514
Granted (in shares) |  | 24,573 | 21,824 | 19,075
Assumed in IAA acquisition (in shares) |  | 0 |  |
Vested and settled (in shares) |  | (32,378) | (70,048) | 0
Forfeited (in shares) |  | 0 | 0 | 0
Outstanding ending balance (in shares) |  | 100,560 | 108,365 | 156,589
Fair Value of common shares |  |  |  |
Outstanding beginning balance, Weighted average grant date fair value (usd per share) |  | $ 39.35 | $ 35.28 | $ 32.06
Granted, Weighted average grant date fair value (usd per share) |  | 55.49 | 58.24 | 58.48
Assumed in IAA acquisition, Weighted average grant date fair value (per share) |  | 0 |  |
Vested and settled, Weighted average grant date fair value (usd per share) |  | 54.68 | 36.13 | 0
Forfeited, Weighted average grant date fair value (usd per share) |  | 0 | 0 | 0
Outstanding ending balance, Weighted average grant date fair value (usd per share) |  | $ 38.36 | $ 39.35 | $ 35.28

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(03) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(03) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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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://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued 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://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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