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Income Taxes (Gross Unrecognized Tax Benefit) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Unrecognized Tax Benefits [Roll Forward]    
Balance at beginning of year $ 3.7 $ 4.3
Increases related to prior year positions 0 0.5
Decreases due to lapse in statute of limitations (1.0) (1.1)
Balance at end of year $ 2.7 $ 3.7