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Acquisitions and Divestitures - Divestitures (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Oct. 30, 2020
Divestitures        
Gain (Loss) on Disposition of Assets $ 33.0   $ 96.0  
Disposed of by Sale, Not Discontinued Operations [Member]        
Divestitures        
Gain (Loss) on Disposition of Assets 33.0   96.0  
Aggregate sales prices for divestitures of hauling and ancillary operations 856.0 $ 8.0 $ 153.0  
Disposed of by Sale, Not Discontinued Operations [Member] | Maximum [Member]        
Divestitures        
Gain (Loss) on Disposition of Assets   $ (1.0)    
Advanced Disposal [Member] | Disposed of by Sale, Not Discontinued Operations [Member]        
Divestitures        
Divestiture consideration       $ 856.0
Gain (Loss) on Disposition of Assets $ 33.0