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Acquisitions - Other Acquisitions (Details)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
item
Acquisitions      
Number of acquisitions | item     2
Total purchase price   $ 41.6 $ 2.6
Walker      
Acquisitions      
Total purchase price $ 235.4    
Amount allocated to goodwill and intangible assets for acquisitions 187.0    
Purchase price paid in cash 178.0    
Promissory note payable 25.0    
Advance to former owners 20.5    
Contingent earn-out obligation 19.5    
Tax equalization payment 0.2    
Working capital adjustment $ 7.8