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Discontinued Operations Discontinued Operations (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Discontinued Operations (Textuals) [Abstract]        
Net after-tax benefit relating to changes in estimate for environmental and legal matters of divested businesses $ 0 $ 0.7 $ 0 $ 0.7