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Intangible Assets - Gross and Net Intangible Assets by Major Class (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Sep. 30, 2016
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Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Computer Software, Gross | $ 25.3 | $ 22.8
Finite-Lived Intangible Assets, Gross | 22.7 | 17.8
Finite-Lived Intangible Assets, Accumulated Amortization | (10.4) | (8.7)
Finite-Lived Intangible Assets, Net | 12.3 | 9.1
Trade Names [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Trade Names, Gross | 0.0 | 1.1
Finite-Lived Intangible Assets, Accumulated Amortization | 0.0 | 0.6
Finite-Lived Intangible Assets, Net | 0.0 | 0.5
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 | (2.5) | (2.4)
Finite-Lived Intangible Assets, Net | 0.2 | 0.3
Customer Relationships [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Customer Lists, Gross | 20.0 | 14.0
Finite-Lived Intangible Assets, Accumulated Amortization | (7.9) | (5.7)
Finite-Lived Intangible Assets, Net | $ 12.1 | $ 8.3

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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=66006027&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=66006027&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=66006027&loc=d3e16323-109275 + Details
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