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Landfill and Environmental Costs (Tables)
 9 Months Ended
Sep. 30, 2023
Environmental Remediation Obligations [Abstract]  
Schedule of accrued landfill and environmental costs A summary of accrued landfill and environmental liabilities as of September 30, 2023 and December 31, 2022 follows:
20232022
Landfill final capping, closure and post-closure liabilities$1,867.7 $1,786.4 
Environmental remediation502.0 487.5 
Total accrued landfill and environmental costs2,369.7 2,273.9 
Less: current portion(144.1)(132.6)
Long-term portion$2,225.6 $2,141.3 
Schedule of final capping, closure and post-closure costs The following table summarizes the activity in our asset retirement obligation liabilities, which includes liabilities for final capping, closure and post-closure, for the nine months ended September 30, 2023 and 2022:
20232022
Asset retirement obligation liabilities, beginning of year$1,786.4 $1,507.3 
Non-cash additions46.4 43.2 
Acquisitions, net of divestitures and other adjustments11.8 88.5 
Asset retirement obligation adjustments(9.6)7.2 
Payments(40.5)(35.6)
Accretion expense73.2 66.9 
Asset retirement obligation liabilities, end of period1,867.7 1,677.5 
Less: current portion(79.1)(71.6)
Long-term portion$1,788.6 $1,605.9 
Summary of activity in environmental remediation liabilities The following table summarizes the activity in our environmental remediation liabilities for the nine months ended September 30, 2023 and 2022:
20232022
Environmental remediation liabilities, beginning of year$487.5 $454.9 
Payments(31.4)(37.4)
Accretion expense (non-cash interest expense)13.5 13.4 
Acquisitions, net of divestitures and other adjustments32.4 102.5 
Environmental remediation liabilities, end of period502.0 533.4 
Less: current portion(65.0)(55.3)
Long-term portion$437.0 $478.1