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FAIR VALUE MEASUREMENTS Equity investments without readily determinable fair values and derivatives (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Sep. 12, 2016
Dec. 11, 2015
May 26, 2015
Aug. 07, 2014
Derivatives Not Designated as Hedging Instruments              
Foreign currency gains (losses), net of derivative activity $ 8.0 $ 5.0          
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        
Foreign Currency Contracts, Transaction Risk              
Derivatives Not Designated as Hedging Instruments              
Foreign currency gains (losses) recorded in foreign currency transactions and other (13.0) 21.0          
Foreign Currency Contracts              
Derivatives Not Designated as Hedging Instruments              
Net cash inflow from settlement of derivative contracts included in operating activities 1.0 $ 18.0          
Ctrip.com International, Ltd. | Ctrip convertible debt securities | Long-term Investments              
Derivatives Not Designated as Hedging Instruments              
Cost of Ctrip convertible notes 1,275.0   1,275.0 $ 25.0 $ 500.0 $ 250.0 $ 500.0
Embedded derivative, fair value of embedded derivative $ 0.9   $ 0.1