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Acquisitions - Tellimer (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2020
Exotix Partners, LLP    
Business Acquisition [Line Items]    
Percentage of stock purchased 100.00%  
Tellimer    
Business Acquisition [Line Items]    
Percentage of stock purchased 100.00%  
Purchase price $ 4.7  
Cash and cash equivalents 1.0  
Receivables from clients 1.0  
Property and equipment, net 0.3  
Other assets 3.4  
Liabilities assumed $ 1.0  
Operating revenues post-acquisition results of the acquired business   $ 5.9
Net income (loss) post-acquisition results of the acquired business   $ (0.1)