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Fair Value Measurements - Level 3 Rollforward (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2012
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      
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 $ 548.3         $ 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 7.7   $ 17.4     $ 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) 0.0   (0.1)        
Purchases 0.0   0.0        
Sales and Settlements 0.0   (0.3)        
Principal Reductions 0.0   0.0        
Net transfers to (out of) Level 3 $ 0.9   3.9        
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     35.5       $ 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)     1.9        
Purchases     0.0        
Sales and Settlements     0.0        
Principal Reductions     (0.3)        
Net transfers to (out of) Level 3     $ 0.0