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Mortgage Loans - Mortgage Loans Held for Sale Textual (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Loans Receivable [Line Items]      
Payments for Origination of Mortgage Loans Held-for-sale $ 16,000.0 $ 12,200.0 $ 8,700.0
Proceeds from Sale of Mortgage Loans Held-for-sale 15,500.0 11,800.0 8,400.0
Net gain on sales of loans 619.1 437.2 $ 319.4
Mortgage loans held for sale 2,027.3 1,529.0  
Mortgage loans held for sale, principal amount 1,970.0 1,460.0  
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]      
Loans Receivable [Line Items]      
Mortgage loans held for sale 2,009.4 1,503.2  
Loan Origination Commitments [Member]      
Loans Receivable [Line Items]      
Derivative, Notional Amount 834.6 1,100.0  
Loan Origination Commitments [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]      
Loans Receivable [Line Items]      
Interest Rate Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net $ 1.1 (5.3)  
Other Customer [Member] | Mortgage Loans | Customer Concentration Risk      
Loans Receivable [Line Items]      
Concentration Risk, Percentage 41.00%    
Loans Sold to FNMA or securities backed by GNMA [Member] | Mortgage Loans | Customer Concentration Risk      
Loans Receivable [Line Items]      
Concentration Risk, Percentage 52.00%    
Hedging Instruments Related To IRLCs [Member]      
Loans Receivable [Line Items]      
Derivative, Notional Amount $ 1,400.0 1,600.0  
Hedging Instruments Related To IRLCs [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]      
Loans Receivable [Line Items]      
Interest Rate Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net 8.5 (16.2)  
Uncommitted Loans [Member]      
Loans Receivable [Line Items]      
Mortgage loans held for sale $ 1,300.0 $ 1,200.0