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Condensed Financial Information of Parent Company Only Disclosure - Condensed Statements of Operations (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Condensed Income Statements, Captions [Line Items]      
Total revenues $ 99,887.8 $ 60,856.1 $ 66,036.0
Interest expense 1,115.7 802.2 135.5
Net operating revenues 1,767.2 1,621.0 1,475.9
Non-interest expenses:      
Compensation and benefits 942.4 868.6 794.8
Trade systems and market information 79.1 74.0 66.2
Occupancy and equipment rental 49.0 40.4 36.1
Selling and marketing 52.6 54.0 55.3
Professional fees 69.7 57.0 54.3
Travel and business development 28.4 24.8 16.9
Non-trading technology and support 73.4 61.6 52.4
Depreciation and amortization 53.1 51.0 44.4
Communications 8.5 9.1 8.3
Other 65.1 66.4 60.6
Total compensation and other expenses 1,421.9 1,323.4 1,205.1
Gain on acquisitions and other gains, net 8.8 25.4 6.4
Income before tax 354.1 323.0 277.2
Income tax benefit (93.3) (84.5) (70.1)
Net income 260.8 238.5 207.1
Interest income      
Condensed Income Statements, Captions [Line Items]      
Total revenues 1,396.8 987.6 219.0
StoneX Group      
Condensed Income Statements, Captions [Line Items]      
Total revenues 555.7 615.1 233.8
Interest expense 92.2 83.1 60.9
Net operating revenues 463.5 532.0 172.9
Non-interest expenses:      
Compensation and benefits 137.3 137.9 113.7
Trade systems and market information 9.5 10.2 6.5
Occupancy and equipment rental 10.7 9.3 8.4
Selling and marketing 5.5 2.2 4.9
Professional fees 13.2 12.7 11.9
Travel and business development 3.3 3.1 2.3
Non-trading technology and support 49.4 37.4 30.6
Depreciation and amortization 16.6 13.7 11.0
Communications 2.9 3.4 1.8
Management services fees to affiliates 140.4 188.4 4.3
Other 16.5 12.1 12.4
Total compensation and other expenses 405.3 430.4 207.8
Gain on acquisitions and other gains, net 7.0 2.1 0.0
Income before tax 65.2 103.7 (34.9)
Income tax benefit 39.6 45.4 45.0
Net income 104.8 149.1 10.1
Investment in subsidiaries for equity method accounting, earnings (loss) 156.0 89.4 197.0
StoneX Group | Management fees from affiliates      
Condensed Income Statements, Captions [Line Items]      
Total revenues 274.2 328.7 109.9
StoneX Group | Trading gains (losses), net      
Condensed Income Statements, Captions [Line Items]      
Total revenues (0.6) 1.8 (2.8)
StoneX Group | Consulting fees      
Condensed Income Statements, Captions [Line Items]      
Total revenues 0.0 0.2 0.1
StoneX Group | Interest income      
Condensed Income Statements, Captions [Line Items]      
Total revenues 9.3 3.3 2.2
StoneX Group | Dividend income from subsidiaries      
Condensed Income Statements, Captions [Line Items]      
Total revenues $ 272.8 $ 281.1 $ 124.4