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Shareholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 7 Months Ended | 96 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Oct. 31, 2024 | Sep. 30, 2024 | Mar. 31, 2025 | Mar. 31, 2024 | Jul. 31, 2024 | Dec. 31, 2016 | Dec. 31, 2024 | Jul. 23, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Issuance of shares under employee share purchase plan, shares |  |  | 15,922 | 15,407 |  |  |  |
Issuance of shares under employee share purchase plan |  |  | $ 2,593 | $ 2,183 |  |  |  |
Cash dividend per common share, increase | $ 0.03 |  |  |  |  |  |  |
Cash dividend per share | $ 0.315 | $ 0.285 | $ 0.315 | $ 0.285 |  |  |  |
Maximum number of shares authorized for repurchase |  |  |  |  |  |  |  | 12,901,981
Share repurchase plan expiration date |  |  | Aug. 11, 2025 |  |  |  |  |
Daily repurchase of shares, maximum |  |  |  |  | 60,089 |  |  |
Daily Shares Repurchase (as percentage) |  |  | 25.00% |  |  |  |  |
Repurchase of common stock (shares) |  |  | 0 | 0 |  |  |  |
Common shares, shares issued |  |  | 258,364,361 |  |  |  | 258,067,487 |
Average daily trading volume during period |  |  |  |  | 240,359 |  |  |
Aggregate cost of common stock repurchase |  |  |  |  |  |  |  |
Maximum remaining number of shares available for repurchase |  |  | 12,901,981 |  |  |  |  |
Cash dividends on common stock |  |  | $ 81,477 | $ 73,573 |  |  |  |
2020 Employee Share Purchase Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Minimum percent of eligible compensation to purchase shares |  |  | 1.00% |  |  |  |  |
Maximum percent of eligible compensation to purchase shares |  |  | 10.00% |  |  |  |  |
Maximum number of share authorized to be issued under plan |  |  | 1,000,000 |  |  |  |  |
Minimum | 2020 Employee Share Purchase Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Exercise price percentage of closing price of common shares |  |  | 85.00% |  |  |  |  |
Maximum | 2020 Employee Share Purchase Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Exercise price percentage of closing price of common shares |  |  | 95.00% |  |  |  |  |
Restricted stock units (RSUs) |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vested deferred RSUs outstanding |  |  | 29,092 | 29,980 |  |  |  |
Weighted average grant-date fair value of award |  |  | $ 185.66 |  |  |  |  |
Units granted in period |  |  | 353,840 |  |  |  |  |
Restricted stock units (RSUs) | Progressive Waste Solutions Ltd. |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Units granted in period |  |  | 0 |  |  | 0 | 0 |
Performance shares |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Weighted average grant-date fair value of award |  |  | $ 176.19 |  |  |  |  |
Units granted in period |  |  | 80,104 |  |  |  |  |
Performance shares | 2025 Performance-Based Restricted Share Units, Plan One |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting period of award |  |  | 3 years |  |  |  |  |
Performance period end date |  |  | Dec. 31, 2027 |  |  |  |  |
Deferred share units |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vested deferred RSUs outstanding |  |  | 22,903 |  |  |  | 20,418 |
Weighted average grant-date fair value of award |  |  | $ 189.04 |  |  |  |  |
Units granted in period |  |  | 2,485 |  |  |  |  |
Progressive Waste Solutions Ltd. | Restricted stock units (RSUs) |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vested deferred RSUs outstanding |  |  | 43,716 |  |  |  | 45,466 |

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- Definition Cash dividend per common share, increase. + References No definition available. + Details
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- Definition Daily repurchase of shares, maximum + References No definition available. + Details
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- Definition Percentage of daily repurchases made through the TSX and alternative Canadian trading systems of the average daily trading volume on the TSX. + References No definition available. + Details
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- Definition The number of equity-based instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References No definition available. + Details
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- Definition The lowest percentage of annual salary that an employee is permitted to utilize with respect to the plan. + References No definition available. + Details
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