Fair Value Measurements Fair Value Measurements - Level 3 Rollforward (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2013		Sep. 30, 2012
Debt Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value Inputs, Discount Rate	6.00%
Residential Real Estate [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value Inputs, Discount Rate	18.00%
Homebuilding [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Other Investments	$ 20.3		$ 0
Homebuilding [Member] | Debt Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	3.1	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	18.6	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	(1.4)	[1]
Financial Services [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Mortgage loans held for sale	395.1		345.3
Financial Services [Member] | Loans Receivable [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	0.3	[2]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0	[2]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	(3.5)	[2]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	8.9	[2]
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Homebuilding [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Other Investments	20.3	[1]	0	[1]
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Financial Services [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Mortgage loans held for sale	$ 5.7	[2]	$ 0	[2]
Maximum [Member] | Homebuilding [Member] | Inventories [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value Inputs, Discount Rate	18.00%		18.00%

[1] In October 2012, the Company purchased $18.6 million of defaulted debt securities which are secured by residential real estate. The Company intends to foreclose on the property or negotiate an agreement to obtain the right to take possession of the residential real estate in order to develop the property and ultimately build and sell homes. These securities, which are included in other assets on the consolidated balance sheets, are classified as available for sale and are reflected at fair value. The fair value of these securities was determined by estimating the future cash flows of the securities and the residential real estate utilizing discount rates of 6% and 18%, respectively. Unrealized gains or losses on these securities, net of tax, are recorded in accumulated other comprehensive income (loss) on the consolidated balance sheets.

[2] Mortgage loans held for sale are reflected at fair value. Interest income earned on mortgage loans held for sale is based on contractual interest rates and included in financial services interest and other (income) expense. Mortgage loans held for sale at September 30, 2013 includes $5.7 million of originated loans for which the Company elected the fair value option upon origination and for which the Company has not sold into the secondary market, but plans to sell as market conditions permit. The fair value of these mortgage loans held for sale is generally calculated considering the secondary market and adjusted for the value of the underlying collateral, including interest rate risk, liquidity risk and prepayment risk; therefore, they were transferred from a Level 2 valuation to a Level 3 valuation during fiscal 2013.