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Fair Value Measurements Fair Value Measurements - Level 3 Rollforward (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2012
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Payments to Acquire Other Investments   $ 18.6      
Payments to Acquire Land $ 19.9        
Proceeds from sale (purchases) of debt securities collateralized by residential real estate     $ 35.8 $ (14.8) $ 0.0
Gain on sale of debt securities collateralized by residential real estate     4.5 0.0 0.0
Land [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Payments to Acquire Land 5.1        
Debt Securities [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Payments to Acquire Land $ 14.8        
Homebuilding [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Debt securities collateralized by residential real estate     0.0 33.9  
Homebuilding [Member] | Debt Securities [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Net realized and unrealized gains (losses)     2.2 (1.4)  
Purchases     0.0 14.8  
Sales and Settlements     (35.8) 0.0  
Principal Reductions     (0.3) (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     654.0 631.0  
Financial Services [Member] | Loans Receivable [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Net realized and unrealized gains (losses)     2.4 0.5  
Purchases     0.0 0.0  
Sales and Settlements     (27.1) (3.3)  
Principal Reductions     0.0 0.0  
Net transfers to (out of) Level 3     17.6 4.7  
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     0.0 33.9 20.8
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     $ 6.8 $ 13.9 $ 12.0