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Fair Value Measurements (Details 1) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Sep. 30, 2015
Financial Services [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Real estate owned $ 0.3 $ 0.6
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Homebuilding [Member] | Inventories [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure, Nonrecurring [1],[2] 0.0 10.1
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Homebuilding [Member] | Assets Held-for-sale [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure, Nonrecurring [2],[3] 0.0 2.8
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Financial Services [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other mortgage loans [2],[4] 34.3 15.2
Real estate owned [2],[4] $ 0.0 $ 0.5
Inventories [Member] | Minimum [Member] | Homebuilding [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Inputs, Discount Rate 12.00%  
Inventories [Member] | Maximum [Member] | Homebuilding [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Inputs, Discount Rate 14.00%  
[1] In performing its impairment analysis of communities, discount rates ranging from 12% to 14% were used in the periods presented.
[2] The fair values included in the table above represent only those assets whose carrying values were adjusted to fair value in the respective period and were held at the end of the period.
[3] The fair value of inventory available for sale was determined based on recent offers received from outside third parties, comparable sales or actual contracts.
[4] The fair values of other mortgage loans and real estate owned are determined based on the value of the underlying collateral.