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Net Income Per Share Information | 9 Months Ended
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Sep. 30, 2025
Earnings Per Share [Abstract] |
Net Income Per Share Information | 13.NET INCOME PER SHARE INFORMATION 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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