Landfill and Environmental Costs - Environmental Remediation Liability (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018
Activity in environmental remediation liabilities
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

Accrual for environmental loss contingencies accretion expense.

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Total costs accrued as of the balance sheet date for environmental loss contingencies.

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Amount of expense for newly incurred environmental loss contingencies. Includes, but is not limited to, remediation expense and interest accretion.

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Amount of cash outflow to settle environmental loss contingencies.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable in twelve months or in the next operating cycle if longer.

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Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable after twelve months or beyond the next operating cycle if longer.

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