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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
Feb. 28, 2019
Jun. 30, 2019
Feb. 27, 2019
Business Acquisition [Line Items]      
Aggregate purchase price $ 60    
Subsidiaries      
Business Acquisition [Line Items]      
Subsidiary percent owned   80.10%  
FTT Inc      
Business Acquisition [Line Items]      
Percentage of voting interests acquired 80.10%   80.10%
FTT Inc | Subsidiaries      
Business Acquisition [Line Items]      
Subsidiary percent owned   19.90%  
FTT Core      
Business Acquisition [Line Items]      
Percentage of voting interests acquired 80.10%   80.10%