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Business Acquisitions, Investments and Restructuring Charges - Acquisitions (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Purchase price:      
Cash used in acquisitions, net of cash acquired $ 61.0 $ 62.7  
Excess purchase price allocated as follows:      
Goodwill 11,667.5   $ 11,633.4
Series of Individually Immaterial Business Acquisitions      
Purchase price:      
Cash used in acquisitions, net of cash acquired 52.2 50.6  
Holdbacks 2.5 3.9  
Fair value, future minimum lease payments 0.3 0.0  
Total 55.0 54.5  
Allocated as follows:      
Accounts receivable 2.3 1.6  
Property and equipment 17.3 7.7  
Operating right-of-use lease assets 0.2 0.0  
Other assets 0.2 0.4  
Accounts payable (1.2) 0.0  
Environmental remediation liabilities (1.5) 0.0  
Operating right-of-use lease liabilities (0.2) 0.0  
Other liabilities (0.9) (0.4)  
Fair value of tangible assets acquired and liabilities assumed 16.2 9.3  
Excess purchase price allocated as follows:      
Other intangible assets 1.8 12.7  
Goodwill 37.0 32.5  
Total allocated $ 38.8 $ 45.2