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Revenue and Credit Losses (Tables) | 6 Months Ended
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Jun. 30, 2022
Revenue from Contract with Customer [Abstract] |
Disaggregation of revenue | The following table disaggregates our revenue by service line for the three and six months ended June 30, 2022 and 2021 (in millions of dollars and as a percentage of revenue):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2022 |  | 2021 |  | 2022 |  | 2021
Collection: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential | $ | 654.1 |  |  | 19.2 | % |  | $ | 611.6 |  |  | 21.7 | % |  | $ | 1,282.0 |  |  | 20.1 | % |  | $ | 1,204.7 |  |  | 22.2 | %
Small-container | 975.6 |  |  | 28.6 |  |  | 843.2 |  |  | 30.0 |  |  | 1,891.2 |  |  | 29.6 |  |  | 1,653.4 |  |  | 30.5 |
Large-container | 687.4 |  |  | 20.1 |  |  | 594.6 |  |  | 21.1 |  |  | 1,308.5 |  |  | 20.5 |  |  | 1,129.0 |  |  | 20.9 |
Other | 13.3 |  |  | 0.4 |  |  | 13.0 |  |  | 0.5 |  |  | 25.7 |  |  | 0.4 |  |  | 25.4 |  |  | 0.5 |
Total collection | 2,330.4 |  |  | 68.3 |  |  | 2,062.4 |  |  | 73.3 |  |  | 4,507.4 |  |  | 70.6 |  |  | 4,012.5 |  |  | 74.1 |
Transfer | 407.8 |  |  |  |  | 383.7 |  |  |  |  | 770.4 |  |  |  |  | 715.0 |  |  |
Less: intercompany | (215.9) |  |  |  |  | (208.1) |  |  |  |  | (413.7) |  |  |  |  | (393.2) |  |  |
Transfer, net | 191.9 |  |  | 5.6 |  |  | 175.6 |  |  | 6.2 |  |  | 356.7 |  |  | 5.6 |  |  | 321.8 |  |  | 6.0 |
Landfill | 699.0 |  |  |  |  | 654.2 |  |  |  |  | 1,316.1 |  |  |  |  | 1,219.3 |  |  |
Less: intercompany | (292.9) |  |  |  |  | (283.2) |  |  |  |  | (560.5) |  |  |  |  | (532.5) |  |  |
Landfill, net | 406.1 |  |  | 11.9 |  |  | 371.0 |  |  | 13.2 |  |  | 755.6 |  |  | 11.8 |  |  | 686.8 |  |  | 12.7 |
Environmental solutions | 308.0 |  |  |  |  | 37.6 |  |  |  |  | 416.9 |  |  |  |  | 76.6 |  |  |
Less: intercompany | (13.7) |  |  |  |  | (3.5) |  |  |  |  | (23.3) |  |  |  |  | (7.6) |  |  |
Environmental solutions, net | 294.3 |  | 8.6 |  |  | 34.1 |  | 1.2 |  |  | 393.6 |  | 6.2 |  |  | 69.0 |  | 1.3 |
Other: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recycling processing and commodity sales | 113.6 |  |  | 3.3 |  |  | 103.0 |  |  | 3.7 |  |  | 213.3 |  |  | 3.3 |  |  | 190.6 |  |  | 3.5 |
Other non-core | 77.4 |  |  | 2.3 |  |  | 66.2 |  |  | 2.4 |  |  | 157.0 |  |  | 2.5 |  |  | 127.5 |  |  | 2.4 |
Total other | 191.0 |  |  | 5.6 |  |  | 169.2 |  |  | 6.1 |  |  | 370.3 |  |  | 5.8 |  |  | 318.1 |  |  | 5.9 |
Total revenue | $ | 3,413.6 |  |  | 100.0 | % |  | $ | 2,812.3 |  |  | 100.0 | % |  | $ | 6,383.7 |  |  | 100.0 | % |  | $ | 5,408.2 |  |  | 100.0 | %
Schedule of activity in allowance for doubtful accounts | The following table reflects the activity in our allowance for doubtful accounts for the six months ended June 30, 2022 and 2021:
| 2022 |  | 2021
Balance at beginning of year | $ | 38.5 |  |  | $ | 34.7 |
Additions charged to expense | 17.2 |  |  | 11.4 |
Accounts written-off | (5.1) |  |  | (7.0) |
Balance at end of period | $ | 50.6 |  |  | $ | 39.1 |

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