Landfill and Environmental Costs (Tables)

12 Months Ended

Dec. 31, 2018

Environmental Remediation Obligations [Abstract]

Schedule of landfill and environmental liabilities

A summary of our accrued landfill and environmental liabilities as of December 31 follows: 

	2018			2017
Landfill final capping, closure and post-closure liabilities	$	1,292.0		$	1,257.7
Environmental remediation	540.2			564.0
Total accrued landfill and environmental costs	1,832.2			1,821.7
Less: current portion	(130.6		)	(135.2		)
Long-term portion	$	1,701.6		$	1,686.5

Schedule of activity in asset retirement obligation liabilities, which includes liabilities for 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 years ended December 31:

	2018			2017			2016
Asset retirement obligation liabilities, beginning of year	$	1,257.7		$	1,224.6		$	1,181.6
Non-cash additions	43.9			45.2			41.0
Acquisitions, net of divestitures and other adjustments	(0.7		)	(20.3		)	0.8
Asset retirement obligation adjustments	(17.7		)	(8.9		)	(0.5		)
Payments	(71.9		)	(62.7		)	(77.4		)
Accretion expense	80.7			79.8			79.1
Asset retirement obligation liabilities, end of year	1,292.0			1,257.7			1,224.6
Less: current portion	(76.7		)	(77.4		)	(64.8		)
Long-term portion	$	1,215.3		$	1,180.3		$	1,159.8

Schedule of expected future payments for final capping, closure, and post-closure

The expected future payments for final capping, closure and post-closure as of December 31, 2018 follows: 

2019	$	76.7
2020	89.0
2021	74.7
2022	68.3
2023	74.7
Thereafter	6,114.6
	$	6,498.0

Schedule of activity in environmental remediation liabilities

The following table summarizes the activity in our environmental remediation liabilities for the years ended December 31:

	2018			2017			2016
Environmental remediation liabilities, beginning of year	$	564.0		$	602.9		$	646.1
Net additions charged to expense	5.0			0.4			(1.6		)
Payments	(48.8		)	(54.8		)	(66.8		)
Accretion expense (non-cash interest expense)	20.2			21.0			23.4
Acquisitions, net of divestitures and other adjustments	(0.2		)	(5.5		)	1.8
Environmental remediation liabilities, end of year	540.2			564.0			602.9
Less: current portion	(53.9		)	(57.8		)	(77.9		)
Long-term portion	$	486.3		$	506.2		$	525.0

Schedule of expected undiscounted future payments for remediation costs

The expected undiscounted future payments for remediation costs as of December 31, 2018 follows:

2019	$	53.9
2020	104.7
2021	57.0
2022	49.2
2023	51.8
Thereafter	420.7
	$	737.3