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Financial Instruments - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Derivative [Line Items]    
Contingent consideration $ 70,900,000 $ 71,200,000
Waste Management Contract, Sonoma County    
Derivative [Line Items]    
Contingent consideration 65,200,000  
Potential undiscounted future contingent liability payments, minimum 75,000,000  
Potential undiscounted future contingent liability payments, maximum 165,000,000  
Change in contingent consideration, liability 0  
Landfill Acquisitions    
Derivative [Line Items]    
Contingent consideration 3,900,000  
Change in contingent consideration, liability 0  
Collection Business    
Derivative [Line Items]    
Contingent consideration 2,600,000  
Carrying Amount    
Derivative [Line Items]    
Long-term debt 9,000,000,000.0 8,700,000,000
Contingent consideration 71,700,000 72,000,000.0
Estimate of Fair Value Measurement    
Derivative [Line Items]    
Long-term debt $ 9,500,000,000 $ 9,400,000,000