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Summary of Significant Accounting Policies (Schedule of Allowance for Doubtful Receivables) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Balance at beginning of year $ 4.5 $ 3.9 $ 3.8
Provision for Doubtful Accounts 0.3 0.6 0.2
Balances written off, net of recoveries (0.8) 0.0 (0.2)
Reclassifications 0.1 0.0 0.1
Balance at end of year $ 4.1 $ 4.5 $ 3.9