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Net Income Per Share Information (Tables) | 9 Months Ended
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Sep. 30, 2025
Earnings Per Share [Abstract] |
Basic and Diluted Net Income Per Common Share | The following table sets forth the calculation of the numerator and denominator used in the computation of basic and diluted net income per common share attributable to the Company’s shareholders for the three and nine months ended September 30, 2025 and 2024: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Nine Months Ended
​ | ​ | September 30, | ​ | September 30,
​ |  | 2025 |  | 2024 |  | 2025 |  | 2024
Numerator: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net income attributable to Waste Connections for basic and diluted earnings per share | ​ | $ | 286,271 | ​ | $ | 308,046 | ​ | $ | 818,057 | ​ | $ | 813,577
Denominator: | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
Basic shares outstanding | ​ | ​ | 256,948,902 | ​ | ​ | 258,023,661 | ​ | ​ | 257,835,515 | ​ | ​ | 257,939,935
Dilutive effect of equity-based awards | ​ | ​ | 631,419 | ​ | ​ | 732,867 | ​ | ​ | 649,183 | ​ | ​ | 661,880
Diluted shares outstanding | ​ |  | 257,580,321 | ​ |  | 258,756,528 | ​ |  | 258,484,698 | ​ |  | 258,601,815

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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