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Discontinued Operations and Special Charges (Gains) - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Jan. 01, 2019
Discontinued Operations - Disposed of by Sale | SARL Businesses      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Special charges related to wind-down, legal, professional and other costs   $ 0.1  
Discontinued Operations - Disposed of by Sale | NATG      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Legal, professional, and other costs $ 0.1    
Restitution receipts   0.7  
Professional costs related to restitution proceedings   0.1  
Lease reserve adjustment   0.2  
Discontinued Operations - Disposed of by Sale | NATG | Maximum      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Additional charges   $ 0.5  
NATG | Restatement Adjustment      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Restructuring reserve     $ (3.4)