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INCOME TAXES - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Mar. 31, 2019
Dec. 31, 2016
Operating Loss Carryforwards [Line Items]            
Net deferred tax assets increase   $ (8.7)        
Valuation allowance that reduces certain deferred tax assets   65.8 $ 46.7      
Carryforward Amount   147.7        
Tax benefit from remeasurement of deferred taxes       $ 3.3    
Effects of mandatory deemed repatriation       297.4    
Tax benefit from harvesting foreign tax credits       32.3    
Adjustment to transition tax     12.8      
Deferred tax asset provisional income tax expense (benefit)     (3.7)      
Foreign earnings to be indefinitely reinvested   1,100.0        
Foreign earnings to be repatriated   140.7        
Estimated net tax liability on permanently reinvested earnings   13.6        
Gross uncertain tax positions   203.1 150.7 225.6 $ 203.1 $ 245.5
Reduction in liabilities from offsetting tax benefits   50.1 42.7      
Net amounts that would favorably affect effective tax rate   153.0 108.0      
Accrued interest related to unrecognized tax benefits, net of tax benefit   9.3 4.6      
Tax benefit of accrued interest   3.5 1.9      
Interest expense, net of tax benefit   4.7 (2.8) (7.3)    
Non-U.S.            
Operating Loss Carryforwards [Line Items]            
Tax reductions compared to local statutory rates   $ 157.6 $ 144.9 $ 81.0    
Tax reductions compared to local statutory rates per diluted share (in dollars per share) $ 0.70 $ 0.75   $ 0.39    
Research expenditure tax credits | Carryforward period indefinite | California | State and local jurisdiction            
Operating Loss Carryforwards [Line Items]            
Carryforward Amount   $ 124.4        
Puerto Rico purchases credit | Carryforward period indefinite | Puerto Rico | Non-U.S.            
Operating Loss Carryforwards [Line Items]            
Carryforward Amount   $ 21.8