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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
	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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