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Business Acquisitions, Investments and Restructuring Charges - Acquisitions (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Purchase price:      
Cash used in acquisitions, net of cash acquired of $15.2 and $66.6, respectively $ 1,051.1 $ 2,847.6  
Excess purchase price allocated as follows:      
Goodwill 15,290.7   $ 14,451.5
Series of Individually Immaterial Business Acquisitions      
Purchase price:      
Cash acquired 15.2 66.6  
Cash used in acquisitions, net of cash acquired of $15.2 and $66.6, respectively 938.0 2,583.2  
Holdbacks 9.4 12.6  
Fair value, future minimum finance lease payments 0.6 15.6  
Total 948.0 2,611.4  
Allocated as follows:      
Accounts receivable 25.5 249.2  
Prepaid expenses 0.9 15.6  
Landfill development costs 0.5 495.7  
Property and equipment 223.9 730.6  
Operating right-of-use lease assets 3.4 55.4  
Interest rate swap 0.0 29.1  
Other assets 0.1 42.3  
Inventory 2.1 11.6  
Accounts payable (5.6) (108.9)  
Deferred revenue (8.2) (27.7)  
Environmental remediation liabilities (5.6) (92.9)  
Closure and post-closure liabilities (10.5) (89.3)  
Operating right-of-use lease liabilities (3.4) (55.8)  
Deferred income tax liabilities (23.6) (151.0)  
Other liabilities (0.3) (54.7)  
Fair value of tangible assets acquired and liabilities assumed 199.2 1,049.2  
Excess purchase price to be allocated 748.8 1,562.2  
Excess purchase price allocated as follows:      
Other intangible assets 136.0 169.6  
Goodwill 612.8 1,392.6  
Total allocated $ 748.8 $ 1,562.2