Landfill and Environmental Costs (Tables)

3 Months Ended

Mar. 31, 2019

Environmental Remediation Obligations [Abstract]

Summary of accrued landfill and environmental liabilities

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

	2019		2018
Landfill final capping, closure and post-closure liabilities	$	1,314.0	$	1,292.0
Environmental remediation	527.3		540.2
Total accrued landfill and environmental costs	1,841.3		1,832.2
Less: current portion	(134.0)		(130.6)
Long-term portion	$	1,707.3	$	1,701.6

Summary of activity in asset retirement obligation liabilities, which include liabilities for landfill 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 three months ended March 31, 2019 and 2018:

	2019		2018
Asset retirement obligation liabilities, beginning of year	$	1,292.0	$	1,257.7
Non-cash additions	10.3		10.3
Acquisitions, net of divestitures and other adjustments	0.1		0.1
Asset retirement obligation adjustments	(0.5)		0.3
Payments	(8.4)		(7.3)
Accretion expense	20.5		20.4
Asset retirement obligation liabilities, end of period	1,314.0		1,281.5
Less: current portion	(75.4)		(76.8)
Long-term portion	$	1,238.6	$	1,204.7

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, 2019 and 2018:

	2019		2018
Environmental remediation liabilities, beginning of year	$	540.2	$	564.0
Net adjustments charged to expense	(10.5)		1.4
Payments	(7.2)		(11.2)
Accretion expense (non-cash interest expense)	4.8		5.1
Environmental remediation liabilities, end of period	527.3		559.3
Less: current portion	(58.6)		(63.6)
Long-term portion	$	468.7	$	495.7