Mortgage Loans (Details Textual) (Financial Services [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013	Sep. 30, 2013
Mortgage Loans [Abstract]
Mortgage loans held for sale	$ 342.5		$ 342.5		$ 395.1
Principal Amount Outstanding on Loans Held-for-sale or Securitization or Asset-backed Financing Arrangement	336.4		336.4		381.1
Net gain on sales of loans	23.9	26.7	44.4	54.2
Concentration Risk, Percentage			81.00%
Percentage Of Mortgage Loans Sold To Major Purchasers			26.00%
Interest rate lock commitments [Member]
Derivative [Line Items]
Derivative, Notional Amount	322.7		322.7
Best-efforts and mandatory commitments [Member]
Derivative [Line Items]
Derivative, Notional Amount	27.9		27.9
Hedging Instruments related to IRLCs [Member]
Derivative [Line Items]
Derivative, Notional Amount	264.2		264.2
Mortgage Loans [Abstract]
Notional amounts of hedging instruments, Total	139.8		139.8
Uncommitted Loans [Member]
Mortgage Loans [Abstract]
Mortgage loans held for sale	$ 140.4		$ 140.4