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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, 2025
Sep. 30, 2024
Sep. 30, 2023
Condensed Income Statements, Captions [Line Items]      
Total revenues $ 132,378.2 $ 99,887.8 $ 60,856.1
Interest expense 1,402.7 1,115.7 802.2
Net operating revenues 2,052.8 1,767.2 1,621.0
Non-interest expenses:      
Compensation and benefits 1,107.7 942.4 868.6
Trade systems and market information 83.1 79.1 74.0
Occupancy and equipment rental 55.7 49.0 40.4
Selling and marketing 50.5 52.6 54.0
Professional fees 86.3 69.7 57.0
Travel and business development 33.0 28.4 24.8
Non-trading technology and support 87.3 73.4 61.6
Depreciation and amortization 67.5 53.1 51.0
Communications 9.3 8.5 9.1
Other 66.0 65.1 66.4
Total compensation and other expenses 1,649.5 1,421.9 1,323.4
Gain on acquisitions and other gains, net 5.5 8.8 25.4
Income before tax 408.8 354.1 323.0
Income tax benefit (102.9) (93.3) (84.5)
Net income 305.9 260.8 238.5
Principal gains, net      
Condensed Income Statements, Captions [Line Items]      
Total revenues 1,247.2 1,189.6 1,079.9
Consulting, management, and account fees      
Condensed Income Statements, Captions [Line Items]      
Total revenues 205.9 167.2 159.0
Interest income      
Condensed Income Statements, Captions [Line Items]      
Total revenues 1,734.3 1,396.8 987.6
StoneX Group      
Condensed Income Statements, Captions [Line Items]      
Total revenues 766.5 711.7 704.5
Equity earnings of subsidiaries 512.7 428.8 370.5
Interest expense 95.6 92.2 83.1
Net operating revenues 670.9 619.5 621.4
Non-interest expenses:      
Compensation and benefits 129.9 137.3 137.9
Trade systems and market information 8.1 9.5 10.2
Occupancy and equipment rental 10.1 10.7 9.3
Selling and marketing 2.2 5.5 2.2
Professional fees 26.4 13.2 12.7
Travel and business development 4.1 3.3 3.1
Non-trading technology and support 59.5 49.4 37.4
Depreciation and amortization 18.0 16.6 13.7
Communications 2.6 2.9 3.4
Management services fees to affiliates 151.8 140.4 188.4
Other 15.3 16.5 12.1
Total compensation and other expenses 428.0 405.3 430.4
Gain on acquisitions and other gains, net 0.1 7.0 2.1
Income before tax 243.0 221.2 193.1
Income tax benefit 62.9 39.6 45.4
Net income 305.9 260.8 238.5
StoneX Group | Management fees from affiliates      
Condensed Income Statements, Captions [Line Items]      
Total revenues 245.3 274.2 328.7
StoneX Group | Principal gains, net      
Condensed Income Statements, Captions [Line Items]      
Total revenues 0.4 (0.6) 1.8
StoneX Group | Consulting, management, and account fees      
Condensed Income Statements, Captions [Line Items]      
Total revenues 0.0 0.0 0.2
StoneX Group | Interest income      
Condensed Income Statements, Captions [Line Items]      
Total revenues $ 8.1 $ 9.3 $ 3.3