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Derivative Financial Instruments Derivative Financial Instruments (Tables) | 3 Months Ended
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Dec. 31, 2017
Derivative [Line Items] |
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] |
|  | December 31, 2017 |  | September 30, 2017
|  | Notional |  | Contract Value |  | Notional |  | Contract Value
Brass swap contracts |  | 1.2 Tons |  | $ | 6.4 |  |  | 1.3 Tons |  | $ | 6.6 |
Schedule of Interest Rate Derivatives [Table Text Block] |
|  | December 31, 2017 |  | September 30, 2017
|  | Notional Amount |  | Remaining Years |  | Notional Amount |  | Remaining Years
Interest rate swaps - fixed |  | $ | 300.0 |  |  | 2.3 |  | $ | 300.0 |  |  | 2.6
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] | The fair value of outstanding derivatives recorded in the accompanying Condensed Consolidated Balance Sheets were as follows:
Asset Derivatives |  | Classification |  | December 31, 2017 |  | September 30, 2017
Derivatives designated as hedging instruments: |  |  |  |  |  |
Interest rate swaps |  | Deferred charges and other assets |  | $ | 2.1 |  |  | $ | 0.4 |
Commodity swaps |  | Other receivables, net |  | 0.9 |  |  | 0.6 |
Foreign exchange contracts |  | Other receivables, net |  | 0.2 |  |  | 0.2 |
Interest rate swaps |  | Other receivables, net |  | 0.1 |  |  | — |
Commodity swaps |  | Deferred charges and other assets |  | 0.1 |  |  | — |
Total asset derivatives designated as hedging instruments |  |  |  | 3.4 |  |  | 1.2 |
Derivatives not designated as hedging instruments: |  |  |  |  |  |
Foreign exchange contracts |  | Other receivables, net |  | 0.4 |  |  | 0.3 |
Total asset derivatives |  |  |  | $ | 3.8 |  |  | $ | 1.5 |
Liability Derivatives |  | Classification |  | December 31, 2017 |  | September 30, 2017
Derivatives designated as hedging instruments: |  |  |  |  |  |
Foreign exchange contracts |  | Accounts payable |  | $ | 1.3 |  |  | $ | 2.3 |
Interest rate swaps |  | Other current liabilities |  | 0.2 |  |  | 0.5 |
Foreign exchange contracts |  | Other long-term liabilities |  | — |  |  | 0.3 |
Interest rate swaps |  | Accrued interest |  | — |  |  | 0.2 |
Total liability derivatives |  |  |  | $ | 1.5 |  |  | $ | 3.3 |
Summary of Gain (Loss) Recognized in Income on Derivatives | The following table summarizes the loss associated with derivative contracts not designated as hedges in the accompanying Condensed Consolidated Statements of Operations for the three months ended December 31, 2017 and 2016:
|  |  |  | Three months ended December 31,
|  | Classification |  | 2017 |  | 2016
Foreign exchange contracts |  | Other income, net |  | $ | 0.3 |  |  | $ | (2.1 | )

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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5618551-113959 + 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=64837297&loc=SL5624163-113959 + Details
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- Definition Tabular disclosure of interest rate derivatives, including, but not limited to, the fair value of the derivatives, statement of financial position location, and statement of financial performance location of these instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 + Details
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- Definition Tabular disclosure of the notional amounts of outstanding derivative positions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5579245-113959 + Details
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