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Derivatives - Fair Value of Derivative Financial Instruments (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Sep. 30, 2017
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Derivative instruments designated as a cash flow hedge | Interest rate cap agreements |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Cash Flow Hedge Derivative Instrument Assets at Fair Value | $ 9.4 | $ 4.8
Derivative instruments designated as a cash flow hedge | Interest rate cap agreements | Prepaid expenses and other current assets |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Cash Flow Hedge Derivative Instrument Assets at Fair Value | 6.4 | 3.6
Derivative instruments designated as a cash flow hedge | Interest rate cap agreements | Other assets |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Cash Flow Hedge Derivative Instrument Assets at Fair Value | 3.0 | 1.2
Derivatives not designated as hedging instruments | Forward foreign currency contracts | Prepaid expenses and other current assets |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Cash Flow Hedge Derivative Instrument Assets at Fair Value | 0.8 | 0.4
Derivatives not designated as hedging instruments | Forward foreign currency contracts | Accrued Expenses |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Cash Flow Hedge Derivative Instrument Assets at Fair Value | $ 0.0 | $ 4.0

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- Definition Fair value of all asset derivatives designated as cash flow 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 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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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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