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Summary of Significant Accounting Policies (Schedule of Reserves for Excess and Obsolete Inventory) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of year $ 7.8 $ 8.5 $ 10.6
Provision charged to expense (2.1) (2.1) (2.8)
Inventory disposed (1.5) (2.9) (4.3)
Valuation Allowances and Reserves, Adjustments 0.2 0.1 (0.6)
Balance at end of year $ 8.6 $ 7.8 $ 8.5