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Commitments and Contingencies Commitments and Contingencies (Details 1) (Homebuilding [Member], USD $)
In Millions, unless otherwise specified
6 Months Ended
Mar. 31, 2013
Homebuilding [Member]
 
Rollforward of reserves for legal claims  
Reserves for legal claims, beginning of period $ 544.9
Payments (13.2)
Increase (decrease) in reserve (12.0)
Reserves for legal claims, end of period $ 519.7