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Revenue and Credit Losses (Tables)
 6 Months Ended
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,
 2022202120222021
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 
Transfer407.8 383.7 770.4 715.0 
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 
Landfill699.0 654.2 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 solutions308.0 37.6 416.9 76.6 
Less: intercompany(13.7)(3.5)(23.3)(7.6)
Environmental solutions, net
294.38.6 34.11.2 393.66.2 69.01.3 
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:
20222021
Balance at beginning of year$38.5 $34.7 
Additions charged to expense17.2 11.4 
Accounts written-off(5.1)(7.0)
Balance at end of period$50.6 $39.1