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Acquisitions Coininvest and European Precious Metals Trading Acquisitions (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2019
Apr. 01, 2019
Coininvest and EPMT Acquisitions [Member]    
Business Acquisition [Line Items]    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents   $ 2.0
Business Combination, Acquired Receivables, Gross Contractual Amount   1.2
Business Combination, Acquired Receivable, Fair Value   0.1
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory   9.8
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets   0.2
Business Combination, Consideration Transferred $ 22.0  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets   1.2
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets   15.6
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable   0.2
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities   0.4
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net   15.2
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets   2.1
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles   2.5
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   $ 4.6
Coininvest and European Precious Metals Trading [Member]    
Business Acquisition [Line Items]    
Goodwill, Acquired During Period $ 2.2