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Revenue and Credit Losses (Tables) | 9 Months Ended
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Sep. 30, 2023
Revenue from Contract with Customer [Abstract] |
Disaggregation of revenue | The following table disaggregates our revenue by service line for the three and nine months ended September 30, 2023 and 2022 (in millions of dollars and as a percentage of revenue):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2023 |  | 2022 |  | 2023 |  | 2022
Collection: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential | $ | 718.2 |  |  | 18.8 | % |  | $ | 680.9 |  |  | 18.9 | % |  | $ | 2,103.4 |  |  | 18.9 | % |  | $ | 1,963.0 |  |  | 19.7 | %
Small-container | 1,126.3 |  |  | 29.4 |  |  | 1,021.8 |  |  | 28.4 |  |  | 3,270.2 |  |  | 29.4 |  |  | 2,912.9 |  |  | 29.2 |
Large-container | 753.0 |  |  | 19.7 |  |  | 709.6 |  |  | 19.7 |  |  | 2,192.4 |  |  | 19.7 |  |  | 2,018.0 |  |  | 20.2 |
Other | 19.0 |  |  | 0.5 |  |  | 14.6 |  |  | 0.4 |  |  | 51.9 |  |  | 0.5 |  |  | 40.3 |  |  | 0.4 |
Total collection | 2,616.5 |  |  | 68.4 |  |  | 2,426.9 |  |  | 67.4 |  |  | 7,617.9 |  |  | 68.5 |  |  | 6,934.2 |  |  | 69.5 |
Transfer | 444.3 |  |  |  |  | 412.8 |  |  |  |  | 1,280.5 |  |  |  |  | 1,183.5 |  |  |
Less: intercompany | (238.1) |  |  |  |  | (223.5) |  |  |  |  | (703.3) |  |  |  |  | (637.5) |  |  |
Transfer, net | 206.2 |  |  | 5.4 |  |  | 189.3 |  |  | 5.3 |  |  | 577.2 |  |  | 5.2 |  |  | 546.0 |  |  | 5.5 |
Landfill | 743.2 |  |  |  |  | 703.6 |  |  |  |  | 2,172.4 |  |  |  |  | 2,019.7 |  |  |
Less: intercompany | (306.9) |  |  |  |  | (291.4) |  |  |  |  | (912.6) |  |  |  |  | (851.9) |  |  |
Landfill, net | 436.3 |  |  | 11.4 |  |  | 412.2 |  |  | 11.5 |  |  | 1,259.8 |  |  | 11.3 |  |  | 1,167.8 |  |  | 11.7 |
Environmental solutions | 424.0 |  |  |  |  | 411.0 |  |  |  |  | 1,274.0 |  |  |  |  | 827.8 |  |  |
Less: intercompany | (19.2) |  |  |  |  | (13.8) |  |  |  |  | (62.5) |  |  |  |  | (37.1) |  |  |
Environmental solutions, net | 404.8 |  | 10.6 |  |  | 397.2 |  | 11.0 |  |  | 1,211.5 |  |  | 10.9 |  |  | 790.7 |  | 7.9 |
Other: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recycling processing and commodity sales | 76.3 |  |  | 2.0 |  |  | 86.9 |  |  | 2.4 |  |  | 226.6 |  |  | 2.0 |  |  | 300.4 |  |  | 3.0 |
Other non-core | 85.8 |  |  | 2.2 |  |  | 85.3 |  |  | 2.4 |  |  | 239.9 |  |  | 2.1 |  |  | 242.4 |  |  | 2.4 |
Total other | 162.1 |  | 4.2 |  |  | 172.2 |  |  | 4.8 |  |  | 466.5 |  |  | 4.1 |  |  | 542.8 |  |  | 5.4 |
Total revenue | $ | 3,825.9 |  |  | 100.0 | % |  | $ | 3,597.8 |  |  | 100.0 | % |  | $ | 11,132.9 |  |  | 100.0 | % |  | $ | 9,981.5 |  |  | 100.0 | %
Schedule of activity in allowance for doubtful accounts | The following table reflects the activity in our allowance for doubtful accounts for the nine months ended September 30, 2023 and 2022:
| 2023 |  | 2022
Balance at beginning of year | $ | 51.9 |  |  | $ | 38.5 |
Additions charged to expense | 38.6 |  |  | 27.8 |
Accounts written-off | (7.0) |  |  | (16.9) |
Balance at end of period | $ | 83.5 |  |  | $ | 49.4 |

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