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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 | 9 Months Ended | 12 Months Ended | 96 Months Ended |
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Oct. 31, 2024 | Sep. 30, 2024 | Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Jul. 31, 2025 | Dec. 31, 2016 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2024 | Jul. 22, 2025
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of shares under employee share purchase plan, shares |  |  |  |  |  |  |  |  |  |  | 32,150 | 29,256 |  |  |
Issuance of shares under employee share purchase plan |  |  | $ 2,871 |  | $ 2,593 | $ 2,303 |  | $ 2,183 |  |  | $ 5,464 | $ 4,486 |  |  |
Cash dividend per common share, increase | $ 0.03 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend per share | $ 0.315 | $ 0.285 | $ 0.315 |  |  | $ 0.285 |  |  |  |  | $ 0.945 | $ 0.855 |  |  |
Maximum number of shares authorized for repurchase |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,855,691
Share repurchase plan expiration date |  |  |  |  |  |  |  |  |  |  | Aug. 11, 2026 |  |  |  |
Daily repurchase of shares, maximum |  |  |  |  |  |  |  |  | 80,213 |  |  |  |  |  |
Daily Shares Repurchase (as percentage) |  |  | 25.00% |  |  |  |  |  |  |  | 25.00% |  |  |  |
Repurchase of common stock (shares) |  |  |  |  |  |  |  |  |  |  | 2,393,351 | 0 |  |  |
Common shares, shares issued |  |  | 256,022,442 |  |  |  |  |  |  |  | 256,022,442 |  | 258,067,487 | 258,067,487 |
Common shares, shares outstanding |  |  | 255,976,094 |  |  |  |  |  |  |  | 255,976,094 |  | 258,019,389 | 258,019,389 |
Aggregate cost of stock repurchased |  |  | $ 441,787 | $ 389 |  |  |  |  |  |  | $ 442,176 |  |  |  |
Aggregate cost of common stock repurchase |  |  | $ 0 |  |  |  |  |  |  |  | $ 0 |  | $ 0 | $ 0 |
Maximum remaining number of shares available for repurchase |  |  | 11,761,679 |  |  |  |  |  |  |  | 11,761,679 |  |  |  |
Cash dividends on common stock |  |  | $ 81,000 | $ 81,473 | $ 81,477 | $ 73,983 | $ 73,697 | $ 73,573 |  |  | $ 243,950 | $ 221,253 |  |  |
Common stock, Unlimited shares authorized |  |  |  |  |  |  |  |  |  |  | Unlimited |  | Unlimited |  |
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% |  |  |  |  |  |  |  | 1.00% |  |  |  |
Maximum percent of eligible compensation to purchase shares |  |  | 10.00% |  |  |  |  |  |  |  | 10.00% |  |  |  |
Maximum number of share authorized to be issued under plan |  |  | 1,000,000 |  |  |  |  |  |  |  | 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 |  | 29,980 | 29,092 |  |  | 29,980 |  |  |  |  | 29,092 | 29,980 |  |  |
Weighted average grant-date fair value of award |  |  |  |  |  |  |  |  |  |  | $ 185.64 |  |  |  |
Units granted in period |  |  |  |  |  |  |  |  |  |  | 355,031 |  |  |  |
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 |  |  |  |  |  |  |  | 22,903 |  | 20,418 | 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 |  |  |  |  |  |  |  | 43,716 |  | 45,466 | 45,466 |

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