Landfill and Environmental Costs - Environmental Remediation Liability (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020
Activity in environmental remediation liabilities
Environmental remediation liabilities, beginning of year	$ 462.8	$ 500.2
Net adjustments charged to expense	(1.8)	(1.2)
Payments	(32.2)	(39.8)
Accretion expense (non-cash interest expense)	12.7	13.9
Acquisitions, net of divestitures and other adjustments	25.6	2.9
Environmental remediation liabilities, end of period	467.1	476.0
Less: current portion	(56.3)	(58.2)
Long-term portion	$ 410.8	$ 417.8

Accrual for environmental loss contingencies accretion expense.

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Accrual For Environmental Loss Contingencies, Charges To Expenses For New Losses, Net

+ References

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

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Amount of increase (decrease) in the obligation for environmental loss contingencies from business acquisitions (divestitures).

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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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