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Acquisitions Coininvest and EPMT Acquisitions (Details) - USD ($)
$ in Millions
9 Months Ended
Apr. 01, 2019
Jun. 30, 2019
Business Acquisition [Line Items]    
Business Combination, Consideration Transferred $ 1.4  
GMP Securities Acquisition [Member]    
Business Acquisition [Line Items]    
Cash and cash equivalents 2.0  
Receivables from clients (1) 1.2  
Receivable from affiliate 1.1  
Physical commodities inventory 9.8  
Other assets 1.3  
Total fair value of assets acquired 15.4  
Accounts payable and other accrued liabilities 0.2  
Payables to clients 0.2  
Income taxes payable 0.1  
Total fair value of liabilities assumed 0.5  
Fair value of net assets acquired 14.9  
Business Combination, Consideration Transferred   $ 22.0
Goodwill, Acquired During Period $ 7.1