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Commitments and Contingencies (Details) (Homebuilding [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Homebuilding [Member]
       
Changes in warranty liability        
Warranty liability, beginning of period $ 57.3 $ 48.9 $ 56.8 $ 46.2
Warranties issued 7.2 4.8 18.8 13.1
Changes in liability for pre-existing warranties 0.7 3.2 5.9 6.6
Settlements made (8.0) (8.1) (24.3) (17.1)
Warranty liability, end of period $ 57.2 $ 48.8 $ 57.2 $ 48.8