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Summary of Significant Accounting Policies (Schedule of Allowance for Doubtful Receivables) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of year	$ 5.3	$ 5.3	$ 5.7
Provision for Doubtful Accounts	0.1	0.0	0.4
Balances written off, net of recoveries	(0.2)	(0.1)	(0.8)
Reclassifications	0.0	0.1	0.0
Balance at end of year	$ 5.2	$ 5.3	$ 5.3

X

- Definition

Allowance for Doubtful Receivables, Reclassifications

+ References

No definition available.

+ Details

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X

- Definition

For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 310



-SubTopic 10



-Section 50



-Paragraph 4



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-Section S99



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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of direct write-downs of accounts receivable charged against the allowance.

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-Name Accounting Standards Codification



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- Definition

Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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