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Segment Analysis - Segment Reporting (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Sep. 30, 2023
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | $ 27,069.7 | $ 15,047.9 | $ 68,748.8 | $ 44,220.5 |
Operating revenues: | 913.7 | 776.9 | 2,516.1 | 2,136.1 |
Net operating revenues (loss): | 468.5 | 435.9 | 1,312.4 | 1,217.3 |
Net contribution: | 377.3 | 340.8 | 1,043.1 | 949.1 |
Segment income | 243.7 | 207.9 | 664.5 | 560.2 |
Net operating revenue (loss) with Corporate | (26.9) | (14.1) | (55.3) | (47.0) |
Overhead costs and expenses | (128.8) | (99.3) | (353.2) | (289.1) |
Gain on acquisition | 0.0 | 0.0 | 0.0 | 23.5 |
Income before tax | 88.0 | 94.5 | 256.0 | 247.6 |
Assets | 25,930.8 |  | 25,930.8 |  | $ 21,938.7
Corporate |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 8.3 | 8.6 | 31.9 | 23.9 |
Operating revenues: | 8.3 | 8.6 | 31.9 | 23.9 |
Net operating revenues (loss): | (26.9) | (14.1) | (55.3) | (47.0) |
Assets | 932.2 |  | 932.2 |  | 812.3
Eliminations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | (13.0) | (10.2) | (36.6) | (29.1) |
Operating revenues: | (13.0) | (10.2) | (36.6) | (29.1) |
Commercial |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net contribution: | 168.7 | 156.9 | 414.4 | 413.5 |
Segment income | 125.7 | 117.0 | 298.5 | 302.7 |
Commercial | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 26,410.3 | 14,444.5 | 66,867.4 | 42,188.7 |
Operating revenues: | 262.2 | 252.7 | 661.1 | 655.2 |
Net operating revenues (loss): | 220.5 | 213.6 | 548.1 | 551.4 |
Assets | 4,743.7 |  | 4,743.7 |  | 4,676.3
Institutional |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net contribution: | 104.8 | 81.7 | 307.5 | 265.6 |
Segment income | 62.2 | 45.1 | 188.7 | 162.9 |
Institutional | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 508.9 | 381.1 | 1,408.0 | 1,087.1 |
Operating revenues: | 508.9 | 381.1 | 1,408.0 | 1,087.1 |
Net operating revenues (loss): | 157.7 | 120.3 | 456.1 | 401.4 |
Assets | 18,635.7 |  | 18,635.7 |  | 15,059.3
Retail |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net contribution: | 63.7 | 60.3 | 196.2 | 147.9 |
Segment income | 27.6 | 17.2 | 89.5 | 17.8 |
Retail | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 104.1 | 170.7 | 317.1 | 791.5 |
Operating revenues: | 96.2 | 91.5 | 290.7 | 240.6 |
Net operating revenues (loss): | 68.5 | 65.1 | 209.8 | 159.8 |
Assets | 1,056.9 |  | 1,056.9 |  | 1,014.2
Payments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net contribution: | 40.1 | 41.9 | 125.0 | 122.1 |
Segment income | 28.2 | 28.6 | 87.8 | 76.8 |
Payments | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 51.1 | 53.2 | 161.0 | 158.4 |
Operating revenues: | 51.1 | 53.2 | 161.0 | 158.4 |
Net operating revenues (loss): | 48.7 | $ 51.0 | 153.7 | $ 151.7 |
Assets | $ 562.3 |  | $ 562.3 |  | $ 376.6

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