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Other Expenses - Other Expenses Breakout (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020
Other Expenses [Abstract] |  |  |  |
Insurance | $ 1.9 | $ 1.0 | $ 3.7 | $ 2.0
Office supplies and printing | 0.4 | 0.5 | 0.7 | 0.9
Other clearing related expenses | 1.0 | 0.6 | 2.0 | 1.4
Other non-income taxes | 3.5 | 1.3 | 7.3 | 2.6
Contingent consideration, net | 0.8 | 0.1 | 0.9 | 0.1
Other | 4.5 | 2.9 | 8.6 | 5.5
Total other expenses | $ 12.1 | $ 6.4 | $ 23.2 | $ 12.5

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