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Intangible Assets - Gross and Net Intangible Assets by Major Class (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018
--- | --- | --- | ---
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Indefinite-Lived License Agreements | $ 2.7 | $ 2.7 | $ 0.0
Finite-Lived Intangible Assets, Accumulated Amortization | 0.0 | (14.6) | (12.7)
Finite-Lived Intangible Assets, Net | 9.5 | 9.5 | 11.4
Finite-Lived Intangible Assets, Gross |  | 24.1 | 24.1
Gross Finite and Indefinite-Lived Intangible Assets |  | 26.8 | 24.1
Finite and Indefinited-Lived Accumulated Amortization and Impairment Charges | (14.6) |  | (12.7)
Intangible Assets, Net (Excluding Goodwill) | $ 12.2 |  | 11.4
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 |  | (2.6) | (2.6)
Finite-Lived Intangible Assets, Net |  | 0.1 | 0.1
Customer Relationships [Member] |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Customer Lists, Gross |  | 21.4 | 21.4
Finite-Lived Intangible Assets, Accumulated Amortization |  | (12.0) | (10.1)
Finite-Lived Intangible Assets, Net |  | $ 9.4 | $ 11.3

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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 Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the capitalized costs to acquire rights under a license arrangement (for example, to sell specified products in a specified territory) having an indefinite period of benefit. + 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 (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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