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Business Acquisitions, Investments and Restructuring Charges (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Purchase price:      
Cash used in acquisitions, net of cash acquired $ 62.4 $ 572.7 $ 195.7
Excess purchase price to be allocated as follows:      
Goodwill 11,163.2 11,145.5 $ 10,830.9
Acquired various solid waste businesses [Member]      
Purchase price:      
Cash used in acquisitions, net of cash acquired 41.6 572.7  
Contingent consideration 0.0 70.6  
Holdbacks 3.7 5.1  
Fair value, future minimum lease payments 2.0 1.5  
Total 47.3 649.9  
Allocated as follows:      
Accounts receivable 0.9 39.2  
Landfill airspace 0.0 173.1  
Property and equipment 18.1 158.4  
Other assets 0.1 1.8  
Accounts payable 0.0 (7.1)  
Environmental remediation liabilities (0.1) (5.3)  
Closure and post-closure liabilities (0.2) (27.0)  
Other liabilities (1.1) (10.3)  
Fair value of tangible assets acquired and liabilities assumed 17.7 322.8  
Excess purchase price to be allocated 29.6 327.1  
Excess purchase price to be allocated as follows:      
Other intangible assets 6.9 14.8  
Goodwill 22.7 312.3  
Total allocated $ 29.6 $ 327.1