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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, 2017
Sep. 30, 2016
Financial Services [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage loans held for sale $ 587.3 $ 654.0
Real estate owned 0.0 0.8
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 0.0 1.6
Other mortgage loans 0.0 0.0
Real estate owned 0.0 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 0.6 2.4
Other mortgage loans 1.4 3.8
Real estate owned 0.0 0.1
Inventories [Member] | Nonrecurring [Member] | Level 2 [Member] | Homebuilding [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Inventories 0.0 0.0
Inventories [Member] | Nonrecurring [Member] | Level 3 [Member] | Homebuilding [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Inventories 33.4 5.2
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]    
Inventories 0.0 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]    
Inventories $ 1.2 $ 0.8
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 18.00% 18.00%