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Fair Value Measurements - Level 3 Rollforward (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2016
Jun. 30, 2015
Dec. 31, 2012
Jun. 30, 2017
Jun. 30, 2016
Sep. 30, 2016
Sep. 30, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Proceeds from sale (purchases) of debt securities collateralized by residential real estate $ 35.8            
Payments to Acquire Other Investments     $ 18.6        
Payments to Acquire Land   $ 19.9          
Gain (Loss) on Sale of Debt Investments       $ 0.0 $ 4.5    
Debt Securities [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Payments to Acquire Land   14.8          
Land [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Payments to Acquire Land   $ 5.1          
Financial Services and Other [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Mortgage loans held for sale       627.4   $ 654.0  
Financial Services and Other [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Mortgage loans held for sale       5.3 14.4 6.8 $ 13.9
Financial Services and Other [Member] | Loans Receivable [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Net realized and unrealized gains (losses)       0.8 1.2    
Purchases       0.0 0.0    
Sales and Settlements       (8.9) (15.6)    
Principal Reductions       0.0 0.0    
Net transfers to (out of) Level 3       6.6 14.9    
Homebuilding [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Debt securities collateralized by residential real estate       8.8 0.0 $ 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)       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