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Dispositions and Special Charges - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Special charges   $ 23.9
SARL Business | Maximum    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Additional charges $ 1.0  
Total Discontinued Operations | SARL Business    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Legal, professional and other costs 0.1 0.7
Loss on the sale of business   23.3
Loss on sale of net assets   8.2
Translation adjustments   14.4
Total Discontinued Operations | NATG    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Restitution receipts 0.7  
Lease reserve adjustment (0.2)  
Professional costs related to ongoing restitution proceedings 0.1 0.3
Charges for updating future lease cash flows   $ 0.3
Total Discontinued Operations | NATG | Minimum    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Additional charges 1.0  
Total Discontinued Operations | NATG | Maximum    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Additional charges $ 2.0