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Fair Value of Financial Instruments Fair Value of Financial Instruments (Tables) | 6 Months Ended
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Mar. 31, 2018
Fair Value Disclosures [Abstract] |
Assets and Liabilities Carrying at Fair Value on Recurring Basis | The Company’s consolidated assets and liabilities measured at fair value are summarized according to the hierarchy previously described as follows:
| March 31, 2018 |  | September 30, 2017
| Level 1 |  | Level 2 |  | Level 3 |  | Fair Value |  | Level 1 |  | Level 2 |  | Level 3 |  | Fair Value
Derivative Assets | $ | — |  |  | $ | 3.7 |  |  | $ | — |  |  | $ | 3.7 |  |  | $ | — |  |  | $ | 1.5 |  |  | $ | — |  |  | $ | 1.5 |
Derivative Liabilities | — |  |  | 1.1 |  |  | — |  |  | 1.1 |  |  | — |  |  | 3.3 |  |  | — |  |  | 3.3 |
Schedule of Assets and Liabilities not Measured at Fair Value | Financial Assets and Liabilities Not Measured at Fair Value The carrying amount, estimated fair value and the level of the fair value hierarchy of the Company’s financial instruments which are not measured at fair value in the accompanying Condensed Consolidated Balance Sheets are summarized as follows:
| March 31, 2018
| Level 1 |  | Level 2 |  | Level 3 |  | Fair Value |  | Carrying Amount
Total debt | $ | — |  |  | $ | 5,441.5 |  |  | $ | — |  |  | $ | 5,441.5 |  |  | $ | 5,318.7 |
| September 30, 2017
| Level 1 |  | Level 2 |  | Level 3 |  | Fair Value |  | Carrying Amount
Total debt | $ | — |  |  | $ | 5,839.0 |  |  | $ | 92.0 |  |  | $ | 5,931.0 |  |  | $ | 5,705.1 |

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- Definition Schedule of Financial Assets and Liabilities Not Measured at Fair Value [Table Text Block] + References No definition available. + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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