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Fair Value Measurements Fair Value Measurements - Level 3 Rollforward (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Homebuilding [Member] | Debt Securities [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Net realized and unrealized gains (losses) $ 0.0 $ 2.2  
Purchases 8.8 0.0  
Sales and Settlements 0.0 (35.8)  
Principal Reductions 0.0 (0.3)  
Net transfers to (out of) Level 3 0.0 0.0  
Financial Services [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Mortgage loans held for sale 587.3 654.0  
Financial Services [Member] | Loans Receivable [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Net realized and unrealized gains (losses) 1.3 2.4  
Purchases 0.0 0.0  
Sales and Settlements (13.4) (27.1)  
Principal Reductions 0.0 0.0  
Net transfers to (out of) Level 3 10.9 17.6  
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Homebuilding [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Debt securities collateralized by residential real estate 8.8 0.0 $ 33.9
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 $ 5.6 $ 6.8 $ 13.9