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Acquisitions GMP Securities, LLC (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Jun. 30, 2019
Sep. 30, 2019
Jan. 14, 2019
Business Acquisition [Line Items]      
Business Combination, Bargain Purchase, Gain Recognized, Amount $ 5.4    
GMP Securities Acquisition [Member]      
Business Acquisition [Line Items]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents     $ 1.1
Business Combination, Acquired Receivables, Gross Contractual Amount     7.7
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Assets     7.1
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets     2.7
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment     0.7
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets     0.7
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets     20.0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable     1.9
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other     0.1
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual   $ 8.2  
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual   2.1  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Liabilities     4.4
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities     6.4
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net     $ 13.6
Business Combination, Consideration Transferred $ 8.2    
Business Combination, Bargain Purchase, Gain Recognized, Amount   $ 5.4