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CONSOLIDATED FINANCIAL STATEMENT DETAILS - Cash and cash equivalents and Restricted cash (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash and cash equivalents:      
Cash on hand and balances with banks $ 600.8 $ 514.0  
Short-term deposits 425.0 313.0  
Total cash and cash equivalents 1,025.8 827.0 $ 1,043.9
Restricted cash:      
Restricted cash $ 12.1 $ 11.6