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Landfill and Environmental Costs - Accrued Landfill and Environmental Costs (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Environmental Remediation Obligations [Abstract]        
Landfill final capping, closure and post-closure liabilities $ 1,358.9 $ 1,335.6 $ 1,314.0 $ 1,292.0
Environmental remediation 488.7 500.2 $ 527.3 $ 540.2
Total accrued landfill and environmental costs 1,847.6 1,835.8    
Less: current portion (131.1) (132.6)    
Long-term portion $ 1,716.5 $ 1,703.2