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Shareholders' Equity | 9 Months Ended
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Sep. 30, 2025
Shareholders' Equity [Abstract] |
Shareholders' Equity | 16.SHAREHOLDERS’ EQUITY Share-Based Compensation Restricted Share Units A summary of activity related to restricted share units (“RSUs”) during the nine-month period ended September 30, 2025, is presented below: ​
​ | ​ | ​
​ |  | Unvested Shares
Outstanding at December 31, 2024 |  | 912,560
Granted |  | 355,031
Forfeited |  | (36,129)
Vested and issued |  | (352,111)
Outstanding at September 30, 2025 |  | 879,351
​ The weighted average grant-date fair value per share for the common shares underlying the RSUs granted during the nine-month period ended September 30, 2025 was $185.64. Recipients of the Company’s RSUs who participate in the Company’s Nonqualified Deferred Compensation Plan may have elected in years prior to 2015 to defer some or all of their RSUs as they vest until a specified date or dates they choose. At the end of the deferral periods, unless a qualified participant makes certain other elections, the Company issues to recipients who deferred their RSUs common shares of the Company underlying the deferred RSUs. At September 30, 2025 and 2024, the Company had 29,092 and 29,980 vested deferred RSUs outstanding, respectively. Performance-Based Restricted Share Units A summary of activity related to performance-based restricted share units (“PSUs”) during the nine-month period ended September 30, 2025, is presented below: ​
​ | ​ | ​
​ |  | Unvested Shares
Outstanding at December 31, 2024 |  | 219,143
Granted |  | 80,104
Vested and issued |  | (87,964)
Outstanding at September 30, 2025 |  | 211,283
​ During the nine months ended September 30, 2025, the Company’s Compensation Committee granted PSUs with three-year performance-based metrics that the Company must meet before those awards may be earned, and the performance period for those grants ends on December 31, 2027. The Compensation Committee will determine the achievement of performance results and corresponding vesting of PSUs for each performance period. The weighted average grant-date fair value per share for the common shares underlying all PSUs granted during the nine-month period ended September 30, 2025 was $176.19. Deferred Share Units A summary of activity related to deferred share units (“DSUs”) during the nine-month period ended September 30, 2025, is presented below: ​
​ | ​ | ​
​ |  | Vested Shares
Outstanding at December 31, 2024 |  | 20,418
Granted |  | 2,485
Outstanding at September 30, 2025 |  | 22,903
​ The DSUs consist of a combination of DSU grants outstanding under the Progressive Waste share-based compensation plans that were continued by the Company following the Progressive Waste acquisition and DSUs granted by the Company since the Progressive Waste acquisition. The weighted average grant-date fair value per share for the common shares underlying the DSUs granted during the nine-month period ended September 30, 2025 was $189.04. Other Restricted Share Units RSU grants outstanding under the Progressive Waste share-based compensation plans were continued by the Company following the Progressive Waste acquisition and allow for the issuance of shares or cash settlement to employees upon vesting or other distribution events. A summary of activity related to Progressive Waste RSUs during the nine-month period ended September 30, 2025, is presented below: ​
​ | ​ | ​
Outstanding at December 31, 2024 |  | 45,466
Cash settled |  | (1,750)
Outstanding at September 30, 2025 |  | 43,716
​ No RSUs under the Progressive Waste share-based compensation plans were granted subsequent to June 1, 2016. Employee Share Purchase Plan On May 15, 2020, the Company’s shareholders approved the 2020 Employee Share Purchase Plan (the “ESPP”). Under the ESPP, qualified employees may elect to have payroll deductions withheld from their eligible compensation on each payroll date in amounts equal to or greater than one percent (1%) but not in excess of ten percent (10%) of eligible compensation in order to purchase the Company’s common shares under certain terms and subject to certain restrictions set forth in the ESPP. The exercise price is equal to 95% of the closing price of the Company’s common shares on the last day of the relevant offering period, provided, however, that such exercise price will not be less than 85% of the volume weighted average price of the Company’s common shares as reflected on the Toronto Stock Exchange (the “TSX”) over the final five trading days of such offering period. The maximum number of shares that may be issued under the ESPP is 1,000,000. Under the ESPP, employees purchased 32,150 of the Company’s common shares for $5,464 during the nine months ended September 30, 2025. Under the ESPP, employees purchased 29,256 of the Company’s common shares for $4,486 during the nine months ended September 30, 2024. Normal Course Issuer Bid On July 22, 2025, the Board of Directors of the Company approved, subject to receipt of regulatory approvals, the annual renewal of the Company’s normal course issuer bid (the “NCIB”) to purchase up to 12,855,691 of the Company’s common shares during the period of August 12, 2025 to August 11, 2026 or until such earlier time as the NCIB is completed or terminated at the option of the Company. The renewal followed the conclusion of the Company’s NCIB that expired August 11, 2025. The Company received TSX approval for its annual renewal of the NCIB on August 8, 2025. Under the NCIB, the Company may make share repurchases only in the open market, including on the TSX, the New York Stock Exchange (the “NYSE”), the NYSE Texas and/or alternative Canadian trading systems, at the prevailing market price at the time of the transaction. In accordance with TSX rules, any daily repurchases made through the TSX and alternative Canadian trading systems is limited to a maximum of 80,213 common shares, which represents 25% of the average daily trading volume on the TSX for the period from February 1, 2025 to July 31, 2025. The TSX rules also allow the Company to purchase, once a week, a block of common shares not owned by any insiders, which may exceed such daily limit. The maximum number of shares that can be purchased per day on the NYSE and NYSE Texas will be 25% of the average daily trading volume on such exchanges for the four calendar weeks preceding the date of purchase, subject to certain exceptions for block purchases. The timing and amounts of any repurchases pursuant to the NCIB will depend on many factors, including the Company’s capital structure, the market price of the common shares, any share buyback taxes applicable and overall market conditions. All common shares purchased under the NCIB shall be immediately cancelled following their repurchase. For the nine months ended September 30, 2025, the Company repurchased 2,393,351 common shares pursuant to the NCIB in effect during that period at an aggregate cost of $442,176. For the nine months ended September 30, 2024, the Company did not repurchase any common shares pursuant to the NCIB in effect during that period. As of September 30, 2025, the remaining maximum number of shares available for repurchase under the current NCIB was 11,761,679. Cash Dividend In October 2024, the Company announced that its Board of Directors increased its regular quarterly cash dividend by $0.03, from $0.285 to $0.315 per Company common share. Cash dividends of $243,950 and $221,253 were paid during the nine months ended September 30, 2025 and 2024, respectively.

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