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Divestitures (Details)
$ in Millions
 3 Months Ended
Sep. 30, 2016
USD ($)
stores
Jun. 30, 2016
USD ($)
stores
Mar. 31, 2016
USD ($)
stores
Mar. 31, 2015
USD ($)
stores
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Gain on disposal | $ $ 11.8 $ 11.5    
Domestic Stores Divested [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Number of stores divested | stores 1 1    
Import Stores Divested [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Number of stores divested | stores 1 6 2 2
Gain on disposal | $     $ 6.2 $ 1.4