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Fair Value Measurements Fair Value Measurements - Level 3 Rollforward (Details)
$ in Millions
12 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group $ 1,072.0 $ 796.4  
Payments for (Proceeds from) Available-for-sale Securities, Short-term 0.0 (7.3) $ 8.8
Gain (Loss) on Sale of Debt Investments   (2.4)  
Debt Securities [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Net realized and unrealized gains (losses) 0.0 0.0  
Purchases 0.0 0.0  
Sales and Settlements 0.0 (4.9)  
Principal Reductions 0.0 0.0  
Net transfers to (out of) Level 3 0.0 0.0  
Loans Receivable [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Net realized and unrealized gains (losses) 0.9 0.6  
Purchases 0.0 0.0  
Sales and Settlements (5.4) (6.8)  
Principal Reductions 0.0 0.0  
Net transfers to (out of) Level 3 6.5 8.4  
Level 3 [Member] | Fair Value, Recurring [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group 9.8 7.8 5.6
Debt securities collateralized by residential real estate $ 3.9 $ 3.9 $ 8.8
Minimum [Member] | Measurement Input, Discount Rate [Member] | Inventories [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Other Real Estate Owned, Measurement Input 0.16    
Maximum [Member] | Measurement Input, Discount Rate [Member] | Inventories [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Other Real Estate Owned, Measurement Input 0.18