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Segment Information - Geographic Information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Revenues from external customers by geographic area    
Total revenues $ 362.6 $ 389.2
United States    
Revenues from external customers by geographic area    
Total revenues 329.5 365.8
Rest-of-World    
Revenues from external customers by geographic area    
Total revenues $ 33.1 $ 23.4