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Landfill and Environmental Costs (Tables)
 6 Months Ended
Jun. 30, 2022
Environmental Remediation Obligations [Abstract]  
Schedule of accrued landfill and environmental costs A summary of accrued landfill and environmental liabilities as of June 30, 2022 and December 31, 2021 follows:
20222021
Landfill final capping, closure and post-closure liabilities$1,657.2 $1,507.3 
Environmental remediation536.9 454.9 
Total accrued landfill and environmental costs2,194.1 1,962.2 
Less: current portion(121.3)(124.5)
Long-term portion$2,072.8 $1,837.7 
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 six months ended June 30, 2022 and 2021:
20222021
Asset retirement obligation liabilities, beginning of year$1,507.3 $1,346.4 
Non-cash additions27.9 23.0 
Acquisitions, net of divestitures and other adjustments88.2 32.6 
Asset retirement obligation adjustments8.0 9.2 
Payments(18.0)(26.8)
Accretion expense44.1 41.1 
Foreign currency translation(0.3)— 
Asset retirement obligation liabilities, end of period1,657.2 1,425.5 
Less: current portion(65.8)(61.0)
Long-term portion$1,591.4 $1,364.5 
Summary of activity in environmental remediation liabilities The following table summarizes the activity in our environmental remediation liabilities for the six months ended June 30, 2022 and 2021:
20222021
Environmental remediation liabilities, beginning of year$454.9 $462.8 
Net adjustments charged to expense— 4.8 
Payments(21.1)(21.7)
Accretion expense (non-cash interest expense)8.6 8.5 
Acquisitions, net of divestitures and other adjustments94.5 14.4 
Environmental remediation liabilities, end of period536.9 468.8 
Less: current portion(55.5)(56.6)
Long-term portion$481.4 $412.2