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Landfill and Environmental Costs (Tables)
 3 Months Ended
Mar. 31, 2020
Environmental Remediation Obligations [Abstract]  
Schedule of accrued landfill and environmental costs
A summary of accrued landfill and environmental liabilities as of March 31, 2020 and December 31, 2019 follows:
20202019
Landfill final capping, closure and post-closure liabilities$1,358.9  $1,335.6  
Environmental remediation488.7  500.2  
Total accrued landfill and environmental costs1,847.6  1,835.8  
Less: current portion(131.1) (132.6) 
Long-term portion$1,716.5  $1,703.2  
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 three months ended March 31, 2020 and 2019:
20202019
Asset retirement obligation liabilities, beginning of year$1,335.6  $1,292.0  
Non-cash additions11.5  10.3  
Acquisitions, net of divestitures and other adjustments0.1  0.1  
Asset retirement obligation adjustments(0.5) (0.5) 
Payments(8.7) (8.4) 
Accretion expense20.9  20.5  
Asset retirement obligation liabilities, end of period1,358.9  1,314.0  
Less: current portion(74.4) (75.4) 
Long-term portion$1,284.5  $1,238.6  
Summary of activity in environmental remediation liabilities
The following table summarizes the activity in our environmental remediation liabilities for the three months ended March 31, 2020 and 2019:
20202019
Environmental remediation liabilities, beginning of year$500.2  $540.2  
Net adjustments charged to expense(0.4) (10.5) 
Payments(17.2) (7.2) 
Accretion expense (non-cash interest expense)4.6  4.8  
Acquisitions, net of divestitures and other adjustments1.5  —  
Environmental remediation liabilities, end of period488.7  527.3  
Less: current portion(56.7) (58.6) 
Long-term portion$432.0  $468.7