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Intangible Assets - Gross and Net Intangible Assets by Major Class (Details) - USD ($) $ in Millions | Sep. 30, 2016 | Sep. 30, 2015
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Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Trade Names, Gross | $ 1.1 |
Finite-Lived Computer Software, Gross | 22.8 | $ 9.0
Finite-Lived Intangible Assets, Gross | 17.8 | 16.7
Finite-Lived Intangible Assets, Accumulated Amortization | (8.7) | (7.2)
Finite-Lived Intangible Assets, Net | 9.1 | 9.5
Gross Finite and Indefinite-Lived Intangible Assets | 17.8 | 17.8
Finite and Indefinited-Lived Accumulated Amortization and Impairment Charges | (8.7) | (7.2)
Intangible Assets, Net (Excluding Goodwill) | 9.1 | 10.6
Trade Names [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Trade Names, Gross | 1.1 | 0.0
Finite-Lived Intangible Assets, Accumulated Amortization | 0.6 | 0.0
Finite-Lived Intangible Assets, Net | 0.5 | 0.0
Computer Software, Intangible Asset [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Computer Software, Gross | 2.7 | 2.7
Finite-Lived Intangible Assets, Accumulated Amortization | (2.4) | (2.3)
Finite-Lived Intangible Assets, Net | 0.3 | 0.4
Customer Relationships [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Customer Lists, Gross | 14.0 | 14.0
Finite-Lived Intangible Assets, Accumulated Amortization | (5.7) | (4.9)
Finite-Lived Intangible Assets, Net | $ 8.3 | $ 9.1

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. In addition, it includes impairment recognized during the life of the intangible that results from the write-down of indefinite-lived intangible assets after comparing the implied fair value of reporting unit indefinite-lived intangible assets with the carrying amount of that indefinite-lived intangible assets, which are assessed at least annually for impairment. + References No definition available. + Details
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- Definition Gross amount of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. In addition, it includes the carrying amount of assets (excluding financial assets) that lack physical substance, excluding goodwill, having a projected indefinite period of benefit. + References No definition available. + 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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- Definition Amount before accumulated amortization of capitalized costs for computer software, including but not limited to, acquired and internally developed computer software. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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- Definition Gross carrying amount before accumulated amortization as of the balance sheet date of an asset comprised of customer information, acquired in a business combination or other transaction, having a finite beneficial life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Gross carrying amount before accumulated amortization as of the balance sheet date of the rights acquired through registration of a trade name to gain or protect exclusive use thereof for a reasonably expected period of economic benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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