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Mortgage Loans - Loan Commitments and Related Derivatives Textual (Details) - Financial Services [Member] - USD ($) $ in Millions | Sep. 30, 2017 | Sep. 30, 2016
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Interest rate lock commitments [Member] |  |
Derivative [Line Items] |  |
Notional amount | $ 446.2 | $ 467.6
Best-efforts whole loan delivery commitments [Member] |  |
Derivative [Line Items] |  |
Notional amount | 26.9 | 37.2
Hedging Instruments Related To IRLCs [Member] |  |
Derivative [Line Items] |  |
Notional amount | $ 389.3 | $ 385.5

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