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INCOME TAXES - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating Loss Carryforwards [Line Items]        
Net deferred tax assets increase $ 67.4      
Valuation allowance that reduces certain deferred tax assets 71.6 $ 65.8    
Carryforward Amount 170.0      
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 599.8      
Estimated net tax liability on permanently reinvested earnings 21.1      
Unrecognized tax benefits 281.8 203.1 150.7 $ 225.6
Estimated decrease in unrecognized tax benefits 95.1 50.1    
Net amounts favorably affecting tax rate 186.7 153.0    
Accrued interest related to unrecognized tax benefits, net of tax benefit 14.3 9.3    
Tax benefit of accrued interest 5.1 3.5    
Interest expense (benefit), net of tax benefit 5.0 4.7 (2.8)  
Non-U.S.        
Operating Loss Carryforwards [Line Items]        
Tax reductions compared to local statutory rates $ 189.2 $ 157.6 $ 144.9  
Tax reductions compared to local statutory rates per diluted share (in dollars per share) $ 0.30 $ 0.25 $ 0.23  
Research expenditure tax credits | Carryforward period indefinite | California | State and local jurisdiction        
Operating Loss Carryforwards [Line Items]        
Carryforward Amount $ 145.1      
Puerto Rico purchases credit | Carryforward period indefinite | Puerto Rico | Non-U.S.        
Operating Loss Carryforwards [Line Items]        
Carryforward Amount $ 23.4