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Acquisitions - Narrative (Details)
$ in Millions
9 Months Ended
Sep. 30, 2019
USD ($)
store
Entity Location [Line Items]  
Aggregate purchase price | $ $ 37.4
Cash paid in aggregate purchase price | $ 34.9
Liabilities incurred in aggregate purchase price | $ $ 2.5
Mexico  
Entity Location [Line Items]  
Number of stores acquired 163
Number of acquisitions 13
U.S.  
Entity Location [Line Items]  
Number of stores acquired 20
Number of acquisitions 3