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Other Expenses - Other Expenses Breakout (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Other Expenses [Abstract]    
Insurance $ 1.8 $ 1.0
Office supplies and printing 0.3 0.4
Other clearing related expenses 1.0 0.8
Other non-income taxes 3.8 1.3
Contingent consideration, net 0.1 0.0
Other 4.1 2.6
Total other expenses $ 11.1 $ 6.1