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Acquisitions - Narrative (Details) - U.S. Operations
$ in Millions
9 Months Ended
Sep. 30, 2021
USD ($)
store
Business Acquisition [Line Items]  
Number of stores acquired | store 28
Number of acquisitions | store 2
Aggregate purchase price $ 50.7
Cash paid in aggregate purchase price 48.5
Liabilities incurred in aggregate purchase price 2.2
Revenue since acquisition 11.1
Transaction and integration costs 1.0
Net loss since acquisition $ (1.4)