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Basis of Presentation (Details)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 24, 2017
USD ($)
Dec. 01, 2015
store
Jun. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
SARL Business          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Note receivable from disposition of SARL business $ 3.3       $ 2.2
NATG          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Number of remaining stores | store   3      
Financial obligations related to leased facilities, carrying value     $ 46.4 $ 46.4  
Reserve for lease obligations     13.0 13.0  
Lease obligations, fair value     46.4 46.4  
Lease reserves for leased facilities     $ 0.1 $ (0.1)  
SARL Business          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Percentage of residual equity position retained 5.00%