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Fair Value Measurements Fair Value Measurements - Level 3 Rollforward (Details)
$ in Millions
12 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Mortgage loans held for sale $ 1,529.0 $ 1,072.0  
Mortgage servicing rights 17.1 0.0  
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 0.0  
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) 0.2 0.9  
Purchases 0.0 0.0  
Sales and Settlements (2.6) (5.4)  
Principal Reductions 0.0 0.0  
Net transfers to (out of) Level 3 7.7 6.5  
Contractual Rights      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Net realized and unrealized gains (losses) 1.9    
Purchases 15.2    
Sales and Settlements 0.0    
Principal Reductions 0.0    
Net transfers to (out of) Level 3 0.0    
Level 3 [Member] | Fair Value, Recurring [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Mortgage loans held for sale 15.1 9.8 $ 7.8
Debt securities collateralized by residential real estate 3.9 3.9 $ 3.9
Mortgage servicing rights $ 17.1 $ 0.0  
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