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Supplemental Cash Flow Information (Schedule of Cash Flow, Supplemental Disclosures) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Schedule of Cash Flow, Supplemental Disclosures [Line Items] |  |  |
Increase (decrease) in other noncurrent assets | $ 1.3 | $ 0.0 | $ (0.3)
Decrease (increase) in other noncurrent liabilities | 28.3 | (25.5) | 51.5
Increase in other current liabilities | 0.0 | 0.1 | 0.0
Decrease (increase) in deferred tax liabilities | 10.6 | (9.8) | 20.1
Decrease (increase) in accumulated other comprehensive loss | 16.4 | (15.6) | 31.7
Increase (Decrease) in Other Operating Assets and Liabilities, Net | 0.0 | 0.0 | 0.0
Cash paid, net: |  |  |
Interest | 36.8 | 48.7 | 49.1
Income taxes | $ 13.3 | $ 2.6 | $ 0.7

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- Definition [Line Items] for Schedule reporting any necessary supplemental cash flow disclosures. + References No definition available. + Details
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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 + Details
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- Definition The increase (decrease) during the reporting period in the account that represents the temporary difference that results from Income or Loss that is recognized for accounting purposes but not for tax purposes and vice versa. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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- Definition The increase (decrease) during the reporting period in other assets used in operating activities less other operating liabilities used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current assets and liabilities, other noncurrent assets and liabilities, or a combination of other current and noncurrent assets and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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