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Revenue and Credit Losses (Tables)
 9 Months Ended
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,
 2023202220232022
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 
Transfer444.3 412.8 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 
Landfill743.2 703.6 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 solutions424.0 411.0 1,274.0 827.8 
Less: intercompany(19.2)(13.8)(62.5)(37.1)
Environmental solutions, net
404.810.6 397.211.0 1,211.5 10.9 790.77.9 
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
162.14.2 172.2 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:
20232022
Balance at beginning of year$51.9 $38.5 
Additions charged to expense38.6 27.8 
Accounts written-off(7.0)(16.9)
Balance at end of period$83.5 $49.4