Landfill and Environmental Costs - Environmental Remediation Liability (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Activity in environmental remediation liabilities
Environmental remediation liabilities, beginning of year	$ 485.4	$ 487.5
Payments	(9.8)	(11.6)
Accretion expense (non-cash interest expense)	4.2	4.6
Environmental remediation liabilities, end of period	479.8	480.5
Less: current portion	(68.8)	(61.3)
Long-term portion	$ 411.0	$ 419.2

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 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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