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Acquisitions UOB Acquisition (Details) - USD ($)
$ in Millions
3 Months Ended 7 Months Ended 9 Months Ended
Dec. 31, 2019
Mar. 31, 2019
Oct. 07, 2019
Jun. 30, 2020
Business Acquisition [Line Items]        
Goodwill, Acquired During Period       $ 4.2
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment       0.1
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles       $ 1.0
UOB Bullion and Futures Limited [Member]        
Business Acquisition [Line Items]        
Business Combination, Consideration Transferred $ 2.5 $ 2.5 $ 5.0  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Equipment     0.8  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles     4.2  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Liabilities     $ 351.8