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Acquisitions UOB Acquisition (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 7 Months Ended
Dec. 31, 2019
Mar. 31, 2019
Mar. 31, 2020
Oct. 07, 2019
Business Acquisition [Line Items]        
Goodwill, Acquired During Period     $ 1.1  
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       0.7
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles       3.2
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Liabilities       $ 351.8