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COMPREHENSIVE INCOME (LOSS) - ADDITIONAL INFORMATION (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Derivative [Line Items]                
Cumulative foreign currency translation adjustment translation losses $ (5,059.1) $ (5,182.9) $ (5,109.5) $ (5,133.0) $ (5,154.3) $ (5,140.1) $ (6,705.2) $ (6,627.9)
Foreign Currency Translation Gain (Loss)                
Derivative [Line Items]                
Foreign currency tax adjustment 143.8     157.4        
Cumulative foreign currency translation adjustment translation losses 429.8     284.7 $ 260.7     $ 104.5
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest, Translation Gain (Loss)                
Derivative [Line Items]                
Cumulative foreign currency translation adjustment translation losses 337.1     172.9        
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest, Net Investment Hedges                
Derivative [Line Items]                
Cumulative foreign currency translation adjustment translation losses $ 92.7     $ 111.8