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Intangible Assets - Indefinite-Lived Intangible Assets (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Sep. 30, 2019
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Indefinite-lived Intangible Assets [Line Items] |  |
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

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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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Namespace Prefix: | intl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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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Namespace Prefix: | us-gaap_
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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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