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Shareholders' Equity | 6 Months Ended
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Jun. 30, 2026
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 six-month period ended June 30, 2026, is presented below: ​
​ | ​ | ​
​ | ​ ​ ​ | Unvested Shares
Outstanding at December 31, 2025 |  | 871,272
Granted |  | 435,780
Forfeited |  | (35,925)
Vested and issued |  | (328,939)
Outstanding at June 30, 2026 |  | 942,188
​ The weighted average grant-date fair value per share for the common shares underlying the RSUs granted during the six-month period ended June 30, 2026 was $156.62. 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 June 30, 2026 and 2025, the Company had 29,092 and 29,092 vested deferred RSUs outstanding, respectively. Performance-Based Restricted Share Units A summary of activity related to performance-based restricted share units (“PSUs”) during the six-month period ended June 30, 2026, is presented below: ​
​ | ​ | ​
​ | ​ ​ ​ | Unvested Shares
Outstanding at December 31, 2025 |  | 211,283
Granted |  | 114,839
Forfeited |  | (951)
Vested and issued |  | (100,737)
Outstanding at June 30, 2026 |  | 224,434
​ During the six months ended June 30, 2026, 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, 2028. 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 six-month period ended June 30, 2026 was $150.06. Deferred Share Units A summary of activity related to deferred share units (“DSUs”) during the six-month period ended June 30, 2026, is presented below: ​
​ | ​ | ​
​ | ​ ​ ​ | Vested Shares
Outstanding at December 31, 2025 |  | 22,903
Granted |  | 3,464
Share settled |  | (2,047)
Outstanding at June 30, 2026 |  | 24,320
​ 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 six-month period ended June 30, 2026 was $160.57. 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 in 2016 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 six-month period ended June 30, 2026, is presented below: ​
​ | ​ | ​
Outstanding at December 31, 2025 | ​ ​ ​ | 43,716
Cash settled |  | —
Outstanding at June 30, 2026 |  | 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 18,135 of the Company’s common shares for $3,031 during the six months ended June 30, 2026. Under the ESPP, employees purchased 15,922 of the Company’s common shares for $2,593 during the six months ended June 30, 2025. Normal Course Issuer Bid On August 8, 2025, the Company announced 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 previous NCIB that expired August 11, 2025. Under the NCIB, the Company may make share repurchases 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 and subject to certain volume limitations in accordance with the rules of the TSX and the SEC. In accordance with TSX rules, any daily repurchases made through the TSX and alternative Canadian trading systems are 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 market conditions, share price and other factors, including potential acquisition growth opportunities. All common shares purchased under the NCIB will be immediately cancelled following their repurchase. For the six months ended June 30, 2026, the Company repurchased 3,757,695 common shares pursuant to the NCIB in effect during that period at an aggregate cost of $614,507. For the six months ended June 30, 2025, the Company repurchased 2,100 common shares pursuant to the NCIB in effect during that period at an aggregate cost of $389. As of June 30, 2026, the remaining maximum number of shares available for repurchase under the current NCIB was 7,638,560. Cash Dividend In October 2025, the Company announced that its Board of Directors increased its regular quarterly cash dividend by $0.035, from $0.315 to $0.350 per Company common share. Cash dividends of $177,101 and $162,950 were paid during the six months ended June 30, 2026 and 2025, respectively.

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