Mortgage Loans (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Sep. 30, 2012
Derivative [Line Items]
Commitment Of Hedged Loans To Third Party Purchasers	3 days
Financial Services [Member]
Mortgage Loans [Abstract]
Mortgage loans held for sale	$ 358.2		$ 358.2		$ 345.3
Aggregate outstanding principal balance of mortgage loans held for sale	357.0		357.0		332.9
Net gain on sales of loans	32.3	20.7	86.5	45.8
Percentage of mortgage loans sold to major purchasers	48.00%
Mortgage loans held for sale not committed to third-party purchasers	199.2		199.2
Notional amounts of hedging instruments, Total	198.0		198.0
Financial Services [Member] | Interest rate lock commitments [Member]
Derivative [Line Items]
Derivative, Notional Amount	402.8		402.8
Financial Services [Member] | Best-efforts and mandatory commitments [Member]
Derivative [Line Items]
Derivative, Notional Amount	25.0		25.0
Financial Services [Member] | Hedging Instruments related to IRLCs [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 338.0		$ 338.0