v3.25.1
Segment Analysis - Segment Reporting (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Sep. 30, 2024
Segment Reporting Information [Line Items]          
Total revenues $ 36,890.7 $ 22,106.1 $ 64,826.0 $ 41,679.1  
Operating revenues: 956.0 818.2 1,900.3 1,602.4  
Net operating revenues (loss): 487.3 422.3 979.4 843.9  
Net contribution: 366.6 329.0 768.0 665.8  
Segment income 229.7 204.7 501.0 420.8  
Net operating loss within Corporate (8.6) (12.8) (29.7) (28.4)  
Overhead costs and expenses (124.0) (119.6) (257.3) (224.4)  
Income before tax 97.1 72.3 214.0 168.0  
Assets 31,282.9   31,282.9   $ 27,466.3
Corporate          
Segment Reporting Information [Line Items]          
Total revenues 16.7 14.4 27.8 23.6  
Operating revenues: 16.7 14.4 27.8 23.6  
Net operating revenues (loss): (8.6) (12.8) (29.7) (28.4)  
Assets 1,051.4   1,051.4   1,123.5
Eliminations          
Segment Reporting Information [Line Items]          
Total revenues (14.2) (11.4) (35.1) (23.6)  
Operating revenues: (14.2) (11.4) (35.1) (23.6)  
Commercial          
Segment Reporting Information [Line Items]          
Net contribution: 139.9 119.3 285.6 245.7  
Segment income 96.7 85.6 198.9 172.8  
Commercial | Operating Segments          
Segment Reporting Information [Line Items]          
Total revenues 36,152.0 21,479.1 63,361.0 40,457.1  
Operating revenues: 248.6 200.5 480.9 398.9  
Net operating revenues (loss): 193.3 164.2 382.5 327.6  
Assets 5,566.4   5,566.4   5,387.0
Institutional          
Segment Reporting Information [Line Items]          
Net contribution: 128.5 102.5 246.3 202.7  
Segment income 86.5 61.3 164.6 126.5  
Institutional | Operating Segments          
Segment Reporting Information [Line Items]          
Total revenues 561.2 463.4 1,100.8 899.1  
Operating revenues: 561.2 463.4 1,100.8 899.1  
Net operating revenues (loss): 191.0 149.8 365.0 298.4  
Assets 23,167.6   23,167.6   19,492.9
Self-Directed/Retail          
Segment Reporting Information [Line Items]          
Net contribution: 59.4 69.9 151.0 132.5  
Segment income 22.0 33.2 78.9 61.9  
Self-Directed/Retail | Operating Segments          
Segment Reporting Information [Line Items]          
Total revenues 124.7 111.3 263.1 213.0  
Operating revenues: 93.4 102.0 217.5 194.5  
Net operating revenues (loss): 64.0 74.3 158.6 141.3  
Assets 994.2   994.2   1,024.1
Payments          
Segment Reporting Information [Line Items]          
Net contribution: 38.8 37.3 85.1 84.9  
Segment income 24.5 24.6 58.6 59.6  
Payments | Operating Segments          
Segment Reporting Information [Line Items]          
Total revenues 50.3 49.3 108.4 109.9  
Operating revenues: 50.3 49.3 108.4 109.9  
Net operating revenues (loss): 47.6 $ 46.8 103.0 $ 105.0  
Assets $ 503.3   $ 503.3   $ 438.8