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Mortgage Loans - Loan Commitments and Related Derivatives (Details) - Financial Services and Other [Member] - USD ($) $ in Millions | Mar. 31, 2017 | Sep. 30, 2016
--- | --- | ---
Interest rate lock commitments [Member] |  |
Derivative [Line Items] |  |
Notional amounts of instruments | $ 643.8 | $ 467.6
Best-efforts and mandatory commitments [Member] |  |
Derivative [Line Items] |  |
Notional amounts of instruments | 55.0 | 37.2
Hedging Instruments related to IRLCs [Member] |  |
Derivative [Line Items] |  |
Notional amounts of instruments | $ 545.2 | $ 385.5

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