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Landfill and Environmental Costs (Tables)
 12 Months Ended
Dec. 31, 2021
Environmental Remediation Obligations [Abstract]  
Schedule of landfill and environmental liabilities A summary of our accrued landfill and environmental liabilities as of December 31 follows:
20212020
Landfill final capping, closure and post-closure liabilities$1,507.3 $1,346.4 
Environmental remediation454.9 462.8 
Total accrued landfill and environmental costs1,962.2 1,809.2 
Less: current portion(124.5)(114.5)
Long-term portion$1,837.7 $1,694.7 
Schedule of activity in asset retirement obligation liabilities, which includes liabilities for final capping, closure and post-closure The following table summarizes the activity in our asset retirement obligation liabilities, which includes liabilities for final capping, closure and post-closure, for the years ended December 31:
202120202019
Asset retirement obligation liabilities, beginning of year$1,346.4 $1,335.6 $1,292.0 
Non-cash additions47.2 42.3 44.9 
Acquisitions, net of divestitures and other adjustments32.1 (10.9)0.2 
Asset retirement obligation adjustments58.5 (44.9)(5.2)
Payments(59.6)(58.6)(78.2)
Accretion expense82.7 82.9 81.9 
Asset retirement obligation liabilities, end of year1,507.3 1,346.4 1,335.6 
Less: Current portion(68.4)(57.5)(75.8)
Long-term portion$1,438.9 $1,288.9 $1,259.8 
Schedule of expected future payments for final capping, closure, and post-closure The expected future payments for final capping, closure and post-closure as of December 31, 2021 follows: 
2022$68.3 
202368.4 
202470.4 
202579.7 
202676.2 
Thereafter6,681.6 
$7,044.6 
Schedule of activity in environmental remediation liabilities The following table summarizes the activity in our environmental remediation liabilities for the years ended December 31:
202120202019
Environmental remediation liabilities, beginning of year$462.8 $500.2 $540.2 
Net additions charged to expense0.5 5.1 (12.5)
Payments(57.1)(63.5)(49.1)
Accretion expense (non-cash interest expense)17.1 18.6 19.0 
Acquisitions, net of divestitures and other adjustments31.6 2.4 2.6 
Environmental remediation liabilities, end of year454.9 462.8 500.2 
Less: current portion(56.1)(57.0)(56.8)
Long-term portion$398.8 $405.8 $443.4 
Schedule of expected undiscounted future payments for remediation costs The expected undiscounted future payments for remediation costs as of December 31, 2021 follows:
2022$56.1 
202356.5 
202460.6 
202551.4 
202647.8 
Thereafter334.3 
$606.7