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Fair Value Measurements - Assets Measured on a Nonrecurring Basis (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Financial Services [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage loans held for sale $ 654.0 $ 631.0
Real estate owned 0.8 0.6
Nonrecurring [Member] | Level 2 [Member] | Financial Services [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage loans held for sale 1.6  
Other mortgage loans 0.0  
Real estate owned 0.0  
Nonrecurring [Member] | Level 3 [Member] | Financial Services [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage loans held for sale 2.4 0.0
Other mortgage loans 3.8 15.2
Real estate owned 0.1 0.5
Inventories [Member] | Nonrecurring [Member] | Level 2 [Member] | Homebuilding [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Inventory held and used 0.0  
Inventories [Member] | Nonrecurring [Member] | Level 3 [Member] | Homebuilding [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Inventory held and used 5.2 10.1
Fair Value Adjusted - Available for Sale [Member] [Member] | Nonrecurring [Member] | Level 2 [Member] | Homebuilding [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Inventory held and used 0.0  
Fair Value Adjusted - Available for Sale [Member] [Member] | Nonrecurring [Member] | Level 3 [Member] | Homebuilding [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Inventory held and used $ 0.8 $ 2.8
Minimum [Member] | Inventories [Member] | Homebuilding [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Inputs, Discount Rate 10.00% 10.00%
Maximum [Member] | Inventories [Member] | Homebuilding [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Inputs, Discount Rate 14.00% 14.00%