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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
Dec. 31, 2017
Jan. 01, 2019
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 $ 178.9 $ 0.0  
Special (gains) charges, net     (0.8) 0.8 0.3  
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       175.8    
Disposed of by Sale | NATG            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Ongoing restitution proceedings         0.7  
Discontinued operations incurred special charges related to updating future lease cash flows         6.9  
Charges for updating future lease cash flows         6.2  
Disposed of by Sale | SARL Business Segment            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Pre-tax gain (loss) on sale of business         (23.7)  
Pre-tax book loss on sale         23.7  
NATG            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Ongoing restitution proceedings       0.1    
Restitution receipts       1.0    
Vendor settlements       0.2    
Discontinued Operations            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Special (gains) charges, net     $ 0.0 0.6 30.6  
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       1.7    
Continuing Operations | NATG            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Special (gains) charges, net       $ 0.8 $ 0.3  
Accounting Standards Update 2016-02 | NATG and Corporate            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Exit liability reclassified to right-of-use asset           $ 4.3
Scenario, Forecast | Discontinued Operations | NATG            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Special (gains) charges, net   $ 1.0        
Germany | Continuing Operations            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Special (gains) charges, net $ (0.8)