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Intangible Assets - Gross and Net Intangible Assets by Major Class (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Sep. 30, 2019
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Acquired Finite-Lived Intangible Assets [Line Items] |  |
Indefinite-Lived License Agreements | $ 2.7 | $ 2.7
Indefinite-lived Intangible Assets (Excluding Goodwill) | 4.8 | 4.8
Finite-Lived Intangible Assets, Accumulated Amortization | (16.2) | (15.5)
Finite-Lived Intangible Assets, Net | 11.2 | 11.9
Other Indefinite-lived Intangible Assets | 2.1 | 2.1
Finite-Lived Intangible Assets, Gross | 27.4 | 27.4
Gross Finite and Indefinite-Lived Intangible Assets | 32.2 | 32.2
Finite and Indefinited-Lived Accumulated Amortization and Impairment Charges | (16.2) | (15.5)
Intangible Assets, Net (Excluding Goodwill) | 16.0 | 16.7
Computer Software, Intangible Asset [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Computer Software, Gross | 5.3 | 5.3
Finite-Lived Intangible Assets, Accumulated Amortization | (3.1) | (3.0)
Finite-Lived Intangible Assets, Net | 2.2 | 2.3
Customer Relationships [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Customer Lists, Gross | 22.1 | 22.1
Finite-Lived Intangible Assets, Accumulated Amortization | (13.1) | (12.5)
Finite-Lived Intangible Assets, Net | $ 9.0 | $ 9.6

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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 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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + 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://fasb.org/us-gaap/role/ref/legacyRef -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=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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