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Landfill and Environmental Costs - Environmental Remediation Liability (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Activity in environmental remediation liabilities    
Environmental remediation liabilities, beginning of year $ 564.0 $ 602.9
Net additions charged to expense 1.4 0.0
Payments (11.2) (11.3)
Accretion expense (non-cash interest expense) 5.1 5.3
Acquisitions, net of divestitures and other adjustments 0.0 (6.3)
Environmental remediation liabilities, end of period 559.3 590.6
Less: current portion (63.6) (75.3)
Long-term portion $ 495.7 $ 515.3