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Acquisitions - Narrative (Details) - U.S. Operations
$ in Millions
6 Months Ended
Jun. 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 48.4
Liabilities incurred in aggregate purchase price 2.3
Revenue since acquisition 3.7
Transaction and integration costs 0.9
Net loss since acquisition $ 0.1