Landfill and Environmental Costs (Tables)

6 Months Ended

Jun. 30, 2019

Environmental Remediation Obligations [Abstract]

Schedule of accrued landfill and environmental costs

A summary of accrued landfill and environmental liabilities as of June 30, 2019 and December 31, 2018 follows:

	2019		2018
Landfill final capping, closure and post-closure liabilities	$	1,330.4	$	1,292.0
Environmental remediation	521.7		540.2
Total accrued landfill and environmental costs	1,852.1		1,832.2
Less: current portion	(142.3)		(130.6)
Long-term portion	$	1,709.8	$	1,701.6

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, 2019 and 2018:

	2019		2018
Asset retirement obligation liabilities, beginning of year	$	1,292.0	$	1,257.7
Non-cash additions	21.6		21.8
Acquisitions, net of divestitures and other adjustments	0.2		1.9
Asset retirement obligation adjustments	(0.5)		(17.6)
Payments	(23.8)		(22.1)
Accretion expense	40.9		40.6
Asset retirement obligation liabilities, end of period	1,330.4		1,282.3
Less: current portion	(76.8)		(81.0)
Long-term portion	$	1,253.6	$	1,201.3

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, 2019 and 2018:

	2019		2018
Environmental remediation liabilities, beginning of year	$	540.2	$	564.0
Net adjustments charged to expense	(10.3)		2.5
Payments	(17.8)		(21.2)
Accretion expense (non-cash interest expense)	9.6		10.1
Environmental remediation liabilities, end of period	521.7		555.4
Less: current portion	(65.5)		(69.5)
Long-term portion	$	456.2	$	485.9