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Debt and Other Obligations - Local bank loans and other short term borrowings (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Revolving Credit Facility    
Debt Instrument [Line Items]    
Amount outstanding $ 43.8  
Deutsche Bank AG | Revolving Credit Facility    
Debt Instrument [Line Items]    
Amount outstanding 67.2 $ 26.4
Unicredit    
Debt Instrument [Line Items]    
Amount outstanding   $ 2.2
Unicredit | Revolving Credit Facility    
Debt Instrument [Line Items]    
Amount outstanding $ 27.2