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Fair Value Measurements - Nonrecurring (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2017
Sep. 30, 2016
Homebuilding [Member] | Inventories [Member] | Minimum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Inputs, Discount Rate 10.00%  
Homebuilding [Member] | Inventories [Member] | Maximum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Inputs, Discount Rate 14.00%  
Homebuilding [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Inventories [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Inventories $ 0.0 $ 0.0
Homebuilding [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] | Assets Held-for-sale [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Inventories 0.0 0.0
Homebuilding [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Inventories [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Inventories 7.9 5.2
Homebuilding [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Assets Held-for-sale [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Inventories 0.0 0.8
Financial Services and Other [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage loans held for sale 627.4 654.0
Real estate owned 0.1 0.8
Financial Services and Other [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [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
Financial Services and Other [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage loans held for sale 2.2 2.4
Other mortgage loans 1.6 3.8
Real estate owned $ 0.0 $ 0.1