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Acquisitions (Tables)
12 Months Ended
Dec. 31, 2021
Business Combination and Asset Acquisition [Abstract]  
Schedule of Business Acquisitions, by Acquisition
The following is a summary of the Company's acquisitions (in millions).

Year Ended December 31,
202120202019
Number of businesses acquiredThreeFourTwo
Aggregate purchase price$221.3 $186.0 $113.0 
Maximum earn out15.0 19.0 — 
Earn out liability at December 31, 20217.0 8.1 — 
Status of purchase accountingOpenClosedClosed
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Generally, working capital adjustments account for the difference between the aggregate purchase price and cash paid, net of cash acquired in the accompanying statements of cash flows.