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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
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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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

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- Definition

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+ References

No definition available.

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