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Income Taxes (Disposal Groups, including Discontinued Operations) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Income Tax Expense (Benefit) $ 18.0 $ 8.8 $ 7.9
Discontinued Operations [Member]
      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Expense from operations   2.1 (48.7)
Valuation Allowance, Deferred Tax Asset, Change in Amount   (2.1) 26.7
Other items   0 0.1
Operating Expense [Member]
      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Expense from operations 30.1 17.5 1.4
Valuation Allowance, Deferred Tax Asset, Change in Amount (9.6) (8.5) 6.5
Other items (2.5)    
Income Tax Expense (Benefit) $ 18.0