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Landfill and Environmental Costs - Accrued Landfill and Environmental Costs (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Environmental Remediation Obligations [Abstract]        
Landfill final capping, closure and post-closure liabilities $ 1,289.9 $ 1,257.7 $ 1,252.4 $ 1,224.6
Environmental remediation liabilities 552.3 564.0 $ 574.8 $ 602.9
Total accrued landfill and environmental costs 1,842.2 1,821.7    
Less: current portion (168.3) (135.2)    
Long-term portion $ 1,673.9 $ 1,686.5