Revenue and Credit Losses (Tables)

9 Months Ended

Sep. 30, 2021

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, 2021 and 2020 (in millions of dollars and as a percentage of revenue):

	Three Months Ended September 30,								Nine Months Ended September 30,
	2021				2020				2021				2020
Collection:
Residential	$	626.7	21.4	%	$	581.2	22.6	%	$	1,831.3	22.0	%	$	1,723.3	22.8	%
Small-container	871.9		29.7		773.7		30.1		2,525.3		30.3		2,321.8		30.6
Large-container	621.7		21.2		553.1		21.5		1,762.0		21.1		1,606.8		21.2
Other	15.3		0.5		13.1		0.5		44.4		0.5		38.0		0.5
Total collection	2,135.6		72.8		1,921.1		74.7		6,163.0		73.9		5,689.9		75.1
Transfer	395.3				352.4				1,110.4				1,004.8
Less: intercompany	(212.6)				(190.9)				(605.9)				(556.9)
Transfer, net	182.7		6.2		161.5		6.3		504.5		6.0		447.9		5.9
Landfill	657.6				597.3				1,871.6				1,719.6
Less: intercompany	(285.6)				(263.4)				(818.1)				(763.9)
Landfill, net	372.0		12.7		333.9		13.0		1,053.5		12.6		955.7		12.6
Environmental solutions	51.4		1.7		24.1		0.9		110.8		1.3		101.0		1.3
Other:
Recycling processing and commodity sales	119.9		4.1		75.0		2.9		310.6		3.8		216.2		2.9
Other non-core	72.3		2.5		56.5		2.2		199.8		2.4		169.7		2.2
Total other	192.2		6.6		131.5		5.1		510.4		6.2		385.9		5.1
Total revenue	$	2,933.9	100.0	%	$	2,572.1	100.0	%	$	8,342.2	100.0	%	$	7,580.4	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, 2021 and 2020:

	2021		2020
Balance at beginning of year	$	34.7	$	34.0
Additions charged to expense	18.7		22.0
Accounts written-off	(11.1)		(22.4)
Balance at end of period	$	42.3	$	33.6