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Other Expenses - Other Expenses Breakout (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Other Expenses [Abstract] |  |  |
Insurance | $ 7.1 | $ 4.7 | $ 3.4
Office supplies and printing | 1.3 | 1.8 | 1.9
Other clearing related expenses | 4.0 | 2.8 | 2.5
Other non-income taxes | 14.8 | 6.6 | 4.6
Contingent consideration, net | 1.1 | 0.5 | 0.0
Other | 18.0 | 13.2 | 10.8
Total other expenses | $ 46.3 | $ 29.6 | $ 23.2

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- Definition The aggregate amount of expenses directly related to the supplies and postage. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details
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- Definition All taxes not related to income of the entity or excise or sales taxes levied on the revenue of the entity that are not reported elsewhere. These taxes could include production, real estate, personal property, and pump tax. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(4)) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
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