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Acquisitions - Additional Information (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
acquisition
Dec. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
company
Dec. 31, 2018
USD ($)
acquisition
Dec. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
company
Dec. 31, 2017
USD ($)
acquisition
Business Acquisition [Line Items]              
Purchase price adjustments   $ 1.0     $ (0.1)    
Goodwill $ 1,224.8 1,224.8 $ 1,224.8 $ 1,215.1 1,215.1 $ 1,215.1 $ 1,208.2
Business Acquisition              
Business Acquisition [Line Items]              
Number of companies acquired 2   2 14   12 14
Consideration transferred $ 24.9 24.9 $ 24.9 $ 30.1 30.1 $ 30.1 $ 115.9
Purchase price adjustments   2.2          
Goodwill $ 8.7 $ 8.7 $ 8.7 $ 7.0 $ 7.0 $ 7.0 $ 35.2