Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2022

Accounting Policies [Abstract]

Schedule of activity in allowance for doubtful accounts

The following table reflects the activity in our allowance for doubtful accounts for the years ended December 31:

	2022		2021		2020
Balance at beginning of year	$	38.5	$	34.7	$	34.0
Additions charged to expense	41.5		19.9		27.8
Accounts written-off	(28.1)		(16.1)		(27.1)
Balance at end of year	$	51.9	$	38.5	$	34.7

Schedule of estimated useful lives of our property and equipment

The estimated useful lives of our property and equipment are as follows:

Buildings and improvements	5 - 30 years
Vehicles	5 - 20 years
Landfill equipment	5 - 7 years
Other equipment	3 - 25 years
Furniture and fixtures	3 - 10 years

A summary of property and equipment, net as of December 31 follows:

	2022		2021
Land	$	779.7	$	694.9
Landfill development costs	9,574.2		8,539.6
Vehicles and equipment	9,465.3		8,576.9
Buildings and improvements	1,704.6		1,508.4
Construction-in-progress – landfill	358.3		279.3
Construction-in-progress – other	358.6		182.9
	$	22,240.7	$	19,782.0
Less: accumulated depreciation, depletion and amortization
Landfill development costs	$	(5,058.9)	$	(4,625.6)
Vehicles and equipment	(5,679.9)		(5,231.6)
Buildings and improvements	(757.9)		(692.7)
	(11,496.7)		(10,549.9)
Property and equipment, net	$	10,744.0	$	9,232.1