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Property, Net (Details) (USD $)
In Millions
Jun. 30, 2011
Sep. 30, 2010
Property at cost $ 1,948.5 $ 1,858.5
Accumulated depreciation (746.6) (639.5)
Property, net 1,201.9 1,219.0
Parent Company [Member]
   
Property at cost 247.8 243.0
Accumulated depreciation $ (174.8) $ (165.7)