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Landfill and Environmental Costs - Environmental Remediation Liability (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Activity in environmental remediation liabilities    
Environmental remediation liabilities, beginning of year $ 454.9 $ 462.8
Accretion expense (non-cash interest expense) 8.6 8.5
Environmental remediation liabilities, end of period 536.9 468.8
Long-term portion 481.4 412.2
Net adjustments charged to expense 0.0 4.8
Accrual for Environmental Loss Contingencies, Payments (21.1) (21.7)
Acquisitions, net of divestitures and other adjustments 94.5 14.4
Less: current portion $ (55.5) $ (56.6)