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Derivative Financial Instruments (Tables) | 6 Months Ended
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Mar. 31, 2018
Derivatives, Fair Value [Line Items] |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] | The fair values of the swap contracts are presented below.
| March 31, |  | September 30,
| 2018 |  | 2017
| (in millions)
Interest rate swap contracts, designated as cash flow hedges in assets: |  |  |
Other noncurrent assets | $ | 1.5 |  |  | $ | — |
| $ | 1.5 |  |  | $ | — |
Interest rate swap contracts, designated as cash flow hedges in liabilities: |  |  |
Other current liabilities | $ | — |  |  | $ | 1.2 |
Other noncurrent liabilities | — |  |  | 1.3 |
| $ | — |  |  | $ | 2.5 |
Currency swap contracts, not designated as hedges: |  |  |
Other noncurrent liabilities | $ | 1.0 |  |  | $ | 1.3 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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