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Acquisitions - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended 21 Months Ended
Jun. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
acquisition
Dec. 31, 2019
USD ($)
Business Acquisition [Line Items]          
Percentage of voting interests acquired   100.00%   100.00%  
Number of businesses acquired | acquisition       4  
Consideration paid to acquire business   $ 4.5 $ 368.4 $ 387.9  
Goodwill   $ 532.2   $ 532.2 $ 528.9
MARS          
Business Acquisition [Line Items]          
Purchase price $ 5.0        
Goodwill $ 3.3