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Landfill and Environmental Costs - Final Capping, Closure and Post-Closure Costs (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Activity in asset retirement obligation liabilities, which includes liabilities for final capping, closure and post-closure    
Asset retirement obligation liabilities, beginning of year $ 1,937.2 $ 1,786.4
Non-cash additions 14.3 15.0
Asset retirement obligation adjustments (1.3) (8.4)
Payments (8.9) (8.8)
Accretion expense 26.6 24.1
Asset retirement obligation liabilities, end of period 1,967.9 1,808.3
Less: current portion (72.4) (73.9)
Long-term portion $ 1,895.5 $ 1,734.4