Other Assets and Accrued Expenses and Other Liabilities (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Homebuilding other assets
Homebuilding other assets	$ 492.9	$ 517.4
Homebuilding [Member]
Homebuilding other assets
Insurance receivables	148.1	162.1	202.0
Earnest money and refundable deposits	100.9	98.5
Accounts and notes receivable	25.0	24.1
Prepaid assets	47.5	49.4
Rental Properties	41.2	41.3
Other Investments	20.3	20.3
Other assets	58.1	64.8
Homebuilding other assets	441.1	460.5
Homebuilding accrued expenses and other liabilities
Construction defect and other litigation liabilities	469.6	482.0	529.8	544.9
Employee compensation and related liabilities	115.7	130.2
Warranty liability	56.7	56.9	56.6	56.8
Accrued interest	46.7	34.0
Federal and state income tax liabilities	64.5	29.9
Construction Payable	40.8	46.3
Customer Deposits, Current	37.4	39.3
Accrual for Taxes Other than Income Taxes, Current	17.4	30.0
Other liabilities	35.5	37.4
Homebuilding accrued expenses and other liabilities	$ 884.3	$ 886.0