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Commodity and Other Repurchase Agreements Commodity and Other Repurchase Agreements (Details) - USD ($)
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Financing Receivable, Gross $ 100,000 $ 1,900,000  
Fair Value of Securities Received as Collateral that Can be Resold or Repledged 2,746,500,000 1,294,800,000  
Financial Instruments Owned and Pledged as Collateral, Amount Eligible to be Repledged by Counterparty 285,500,000 123,000,000  
Securities Loaned, Fair Value of Collateral 1,352,800,000.0 267,900,000.0  
Securities Received as Collateral, Amount Repledged and Sold 9,100,000 27,100,000  
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 285,500,000 123,000,000  
Trading Securities Pledged as Collateral 1,243,200,000 1,481,100,000  
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements   369,800,000 $ 901,300,000
Fair Value of Securities Received as Collateral that Have Been Resold or Repledged $ 441,100,000 $ 473,900,000