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Acquisitions UOB Acquisition (Details) - USD ($)
$ in Millions
3 Months Ended 7 Months Ended
Dec. 31, 2019
Mar. 31, 2019
Oct. 07, 2019
Business Acquisition [Line Items]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Equipment     $ 0.7
Goodwill, Acquired During Period $ 4.3    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Liabilities     295.8
UOB Bullion and Futures Limited [Member]      
Business Acquisition [Line Items]      
Business Combination, Consideration Transferred $ 2.5 $ 2.5 $ 5.0