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Landfill and Environmental Costs - Final Capping, Closure and Post-Closure Costs (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Activity in asset retirement obligation liabilities, which includes liabilities for final capping, closure and post-closure        
Asset retirement obligation liabilities, beginning of year     $ 1,507.3 $ 1,346.4
Non-cash additions     27.9 23.0
Acquisitions, net of divestitures and other adjustments     88.2 32.6
Asset retirement obligation adjustments     8.0 9.2
Payments     (18.0) (26.8)
Accretion expense $ 22.4 $ 20.7 44.1 41.1
Foreign currency translation     (0.3) 0.0
Asset retirement obligation liabilities, end of period 1,657.2 1,425.5 1,657.2 1,425.5
Long-term portion 1,591.4 1,364.5 1,591.4 1,364.5
Less: current portion $ (65.8) $ (61.0) $ (65.8) $ (61.0)