v3.10.0.1
Business Acquisitions and Restructuring Charges - Acquisitions (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Purchase price:      
Cash used in acquisitions, net of cash acquired $ 69.3 $ 81.7  
Excess purchase price allocated as follows:      
Goodwill 11,345.3   $ 11,315.4
Waste Business Acquisitions      
Purchase price:      
Cash used in acquisitions, net of cash acquired 63.6 81.7  
Holdbacks 8.4 3.8  
Fair value of operations surrendered 0.0 2.1  
Total 72.0 87.6  
Allocated as follows:      
Accounts receivable 1.5 1.7  
Landfill airspace 22.2 0.0  
Property and equipment 12.1 30.7  
Other assets 0.1 0.0  
Inventory 0.2 0.4  
Accounts payable (0.3) 0.0  
Environmental remediation liabilities 0.0 (0.1)  
Closure and post-closure liabilities (1.7) 0.0  
Other liabilities (3.9) (1.8)  
Fair value of tangible assets acquired and liabilities assumed 30.2 30.9  
Excess purchase price allocated as follows:      
Other intangible assets 10.5 8.6  
Goodwill 31.3 48.1  
Total allocated $ 41.8 $ 56.7