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FAIR VALUE MEASUREMENTS Equity investments without readily determinable fair values and derivatives (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Derivatives Not Designated as Hedging Instruments          
Foreign currency gains (losses), net of derivative activity $ (13.0) $ (12.0) $ (21.0) $ (17.0)  
Foreign Currency Contracts, Translation Risk          
Derivatives Not Designated as Hedging Instruments          
Foreign currency derivative instruments not designated as hedging instruments at fair value, net 0.0   0.0   $ 0.0
Foreign Currency Contracts, Transaction Risk          
Derivatives Not Designated as Hedging Instruments          
Foreign currency gains (losses) recorded in foreign currency transactions and other 8.0 $ (51.0) (5.0) (30.0)  
Foreign Currency Contracts          
Derivatives Not Designated as Hedging Instruments          
Net cash inflow from settlement of derivative contracts included in operating activities     3.0    
Net cash outflow from settlement of derivative contracts included in operating activities       $ 30.0  
Ctrip.com International, Ltd. | Ctrip convertible debt securities          
Derivatives Not Designated as Hedging Instruments          
Cost of Ctrip convertible notes 1,300.0   1,300.0    
Ctrip.com International, Ltd. | Ctrip convertible debt securities | Long-term Investments          
Derivatives Not Designated as Hedging Instruments          
Cost of Ctrip convertible notes $ 775.0   $ 775.0   $ 1,275.0