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Landfill Accounting
 12 Months Ended
Dec. 31, 2019
Asset Retirement Obligation Disclosure [Abstract]  
Landfill Accounting Landfill Accounting
Liabilities for final closure and post-closure costs consist of the following for the years ended December 31:
 
2019
 
2018
Balance at January 1
$
248.0

 
$
225.9

Increase in retirement obligation
11.0

 
9.7

Accretion of closure and post-closure costs
18.0

 
17.0

Acquisition
—

 
4.9

Asset retirement obligation adjustments
6.9

 
10.7

Costs incurred
(19.7
)
 
(20.2
)
 
264.2

 
248.0

Less: Current portion
(28.0
)
 
(18.6
)
Balance at December 31
$
236.2

 
$
229.4