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Acquisitions and Divestitures - Intangible Allocation (Detail) - USD ($)
$ in Millions
Oct. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Intangible assets      
Other intangible assets   $ 53.0 $ 141.0
Customer and supplier relationships [Member]      
Intangible assets      
Other intangible assets   38.0 124.0
Covenants not-to-compete [Member]      
Intangible assets      
Other intangible assets   $ 15.0 16.0
Other Intangible Assets [Member]      
Intangible assets      
Other intangible assets     $ 1.0
Advanced Disposal [Member]      
Intangible assets      
Other intangible assets $ 604.0    
Advanced Disposal [Member] | Other Intangible Assets [Member]      
Intangible assets      
Other intangible assets $ 29.0    
Weighted average amortization periods 7 years    
Advanced Disposal [Member] | Customer Relationships [Member]      
Intangible assets      
Other intangible assets $ 575.0    
Weighted average amortization periods 15 years