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DISPOSITIONS AND SPECIAL GAINS AND CHARGES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Special (gains) charges, net   $ 0.0 $ (0.8) $ 0.8
NATG        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Pre-tax gain (loss) on sale of business   (0.0) (0.0) 178.9
Disposed of by Sale | NATG        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Restitution receipts   1.9    
Professional fees   0.5    
NATG        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Restitution receipts       1.0
Ongoing restitution proceedings       0.1
Discontinued Operations        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Special (gains) charges, net   1.4 $ 0.0 178.3
Discontinued Operations | NATG        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Special charges (settlement)   $ 0.5    
Discontinued Operations | Disposed of by Sale | French Business Unit        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Pre-tax gain (loss) on sale of business       178.9
Discontinued Operations | NATG        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Special (gains) charges, net       0.6
Lease reserve adjustments       1.7
Vendor settlements receipts       0.2
Continuing Operations | NATG        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Lease reserve adjustments       $ 0.8
Germany | Continuing Operations        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Buyout of outstanding lease obligation $ 0.8