Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2021

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:

	2021		2020		2019
Balance at beginning of year	$	34.7	$	34.0	$	34.3
Additions charged to expense	19.9		27.8		34.0
Accounts written-off	(16.1)		(27.1)		(34.3)
Balance at end of year	$	38.5	$	34.7	$	34.0

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	7 - 40 years
Vehicles	5 - 20 years
Landfill equipment	5 - 7 years
Other equipment	3 - 25 years
Furniture and fixtures	10 years

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

	2021		2020
Land	$	694.9	$	633.4
Landfill development costs	8,539.6		7,991.7
Vehicles and equipment	8,576.9		8,119.0
Buildings and improvements	1,508.4		1,402.5
Construction-in-progress – landfill	279.3		303.8
Construction-in-progress – other	182.9		107.4
	$	19,782.0	$	18,557.8
Less: accumulated depreciation, depletion and amortization
Landfill development costs	$	(4,625.6)	$	(4,249.5)
Vehicles and equipment	(5,231.6)		(4,953.4)
Buildings and improvements	(692.7)		(628.7)
	(10,549.9)		(9,831.6)
Property and equipment, net	$	9,232.1	$	8,726.2

Schedule of New Accounting Pronouncements and Changes in Accounting Principles

Effective January 1, 2021, we adopted the following accounting standard updates (ASUs) as issued by the Financial Accounting Standards Board (FASB):

ASU		Effective Date
ASU 2018-14	Disclosure Framework—Changes to the Disclosure Requirements for Defined Benefit Plans	January 1, 2021
ASU 2019-12	Simplifying the Accounting for Income Taxes	January 1, 2021