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Mortgage Loans - Loan Commitments and Related Derivatives Textual (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Interest rate lock commitments [Member] |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | $ 1,800.0 | $ 727.9
Best-efforts whole loan delivery commitments [Member] |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 84.6 | 25.2
Hedging Instruments Related To IRLCs [Member] |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 1,600.0 | 636.2
Loan Origination Commitments [Member] |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 1,100.0 | 111.4
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Interest rate lock commitments [Member] |  |
Derivative [Line Items] |  |
Interest Rate Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net | 31.3 | 19.2
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Best-efforts whole loan delivery commitments [Member] |  |
Derivative [Line Items] |  |
Interest Rate Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net |  | (1.0)
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Hedging Instruments Related To IRLCs [Member] |  |
Derivative [Line Items] |  |
Interest Rate Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net | (16.2) | (4.1)
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Loan Origination Commitments [Member] |  |
Derivative [Line Items] |  |
Interest Rate Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net | $ (5.3) | $ (0.5)

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