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INCOME TAX - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating Loss Carryforwards [Line Items]        
Income tax expense (benefit) allocated to noncontrolling interest   $ 12.3 $ 10.6 $ 8.6
Provisional income tax benefit related to 2017 US Tax Reform Act   23.3 158.7  
Income tax benefit related to change in tax rate     222.4  
Provisional income tax expense (benefit) from deferred foreign earnings     $ 63.7  
Increase (decrease) in estimated transition tax liability $ (23.3) (40.4)    
Undistributed earnings of foreign subsidiary   27.0    
Tax credit carryforwards   36.1    
Unrecognized that would impact effective tax rate   27.4    
Foreign Tax Authority        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards   176.9    
Domestic Tax Authority        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards   $ 41.6