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Landfill and Environmental Costs - Environmental Remediation Liability (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Activity in environmental remediation liabilities    
Environmental remediation liabilities, beginning of year $ 487.5 $ 454.9
Payments (31.4) (37.4)
Accretion expense (non-cash interest expense) 13.5 13.4
Acquisitions, net of divestitures and other adjustments 32.4 102.5
Environmental remediation liabilities, end of period 502.0 533.4
Less: current portion (65.0) (55.3)
Long-term portion $ 437.0 $ 478.1