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Discontinued Operations and Special Charges (Gains) - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jan. 01, 2019
Discontinued Operations - Disposed of by Sale | NATG          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Vendor settlements $ 0.2 $ 0.1 $ 0.2 $ 0.1  
Professional costs related to restitution proceedings   0.1 0.1 0.2  
Additional charges     $ 1.0    
Lease reserve adjustment   0.1   (0.1)  
Restitution receipts       0.7  
Discontinued Operations - Disposed of by Sale | SARL Businesses          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Net recoveries   0.1      
Escrow funds   0.2   0.2  
Accelerated depreciation   $ 0.1   0.1  
Legal, professional, and other costs       $ 0.1  
NATG | Restatement Adjustment          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Reclassification of restructuring reserve         $ 3.4