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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
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:
 
2018
 
2017
 
2016
Balance at beginning of year
$
38.9

 
$
44.0

 
$
46.7

Additions charged to expense
34.8

 
30.6

 
20.4

Accounts written-off
(39.4
)
 
(35.7
)
 
(23.1
)
Balance at end of year
$
34.3

 
$
38.9

 
$
44.0
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 - 12 years
Landfill equipment
5 - 7 years
Other equipment
3 - 20 years
Furniture and fixtures
10 years
A summary of property and equipment, net as of December 31 follows:
 
2018
 
2017
Land
$
443.6

 
$
433.2

Non-depletable landfill land
167.5

 
166.9

Landfill development costs
7,106.0

 
6,757.3

Vehicles and equipment
7,377.3

 
6,954.3

Buildings and improvements
1,279.8

 
1,221.5

Construction-in-progress - landfill
287.9

 
233.2

Construction-in-progress - other
89.9

 
55.7

 
$
16,752.0

 
$
15,822.1

Less: accumulated depreciation, depletion and amortization
 
 
 
Landfill development costs
$
(3,635.9
)
 
$
(3,317.3
)
Vehicles and equipment
(4,571.1
)
 
(4,259.7
)
Buildings and improvements
(524.9
)
 
(467.7
)
 
(8,731.9
)
 
(8,044.7
)
Property and equipment, net
$
8,020.1

 
$
7,777.4
Schedule of cash, cash equivalents, restricted cash and restricted cash equivalents Beginning-of-period and end-of-period cash, cash equivalents, restricted cash and restricted cash equivalents as presented in the statement of cash flows is reconciled as follows:
 
 
December 31, 2018
 
December 31, 2017
 
December 31, 2016
Cash and cash equivalents
 
$
70.5

 
$
83.3

 
$
67.8

Restricted cash and marketable securities
 
108.1

 
141.1

 
90.5

Less: restricted marketable securities
 
(45.3
)
 
(45.3
)
 
(45.3
)
Cash, cash equivalents, restricted cash and restricted cash equivalents
 
$
133.3

 
$
179.1

 
$
113.0
Schedule of new accounting standards, pro forma information The cumulative effect of the changes made to our consolidated balance sheet for the adoption of ASU 2014-09 was as follows:
 
Balance at
December 31, 2017
 
Adjustments
due to our adoption of
ASU 2014-09
 
Balance at
January 1,
2018
Balance Sheet
 
 
 
 
 
Assets
 
 
 
 
 
Other assets
$
335.2

 
$
43.8

 
$
379.0

 
 
 
 
 
 
Liabilities
 
 
 
 
 
Deferred income taxes and other long-term tax liabilities, net
$
796.4

 
$
10.4

 
$
806.8

 
 
 
 
 
 
Equity
 
 
 
 
 
Retained earnings
$
4,152.5

 
$
33.4

 
$
4,185.9

The impact of our adoption of the new revenue recognition standard on our consolidated income statement for the year ended December 31, 2018 was as follows:
 
 
For the year ended December 31, 2018
 
 
As Reported
 
Effect of Change
 
As Computed Excluding the Adoption of
ASU 2014-09
Income Statement
 
 
 
 
 
 
Revenue
 
$
10,040.9

 
$
342.9

 
$
10,383.8

Expenses:
 
 
 
 
 
 
Cost of operations
 
$
6,150.0

 
$
337.0

 
$
6,487.0

Depreciation, amortization and depletion
 
$
1,033.4

 
$
5.9

 
$
1,039.3

Selling, general and administrative
 
$
1,059.5

 
$
0.4

 
$
1,059.9

Operating income
 
$
1,735.8

 
$
(0.4
)
 
$
1,735.4