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Fair Value Measurements (Details 1) (Level 3 [Member], Fair Value, Measurements, Nonrecurring [Member], USD $)
In Millions
Jun. 30, 2011
Sep. 30, 2010
Homebuilding [Member]
   
Fair value measurements of assets on a non-recurring basis    
Inventory held and used $ 20.3 $ 34.0
Financial Services [Member]
   
Fair value measurements of assets on a non-recurring basis    
Other mortgage loans 30.8 27.5
Real estate owned $ 0.6 $ 3.1