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Segment and Geographic Information - Schedule of Revenue Long-Lived Assets, by Geographical Areas (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenues $ 132,378.2 $ 99,887.8 $ 60,856.1
Operating revenues 4,126.9 3,436.2 2,914.1
Long-lived assets 166.6 143.1 123.5
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenues 7,760.5 6,026.3 6,017.4
Operating revenues 3,013.6 2,507.0 2,120.4
Long-lived assets 77.5 76.2 76.0
Europe      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenues 3,107.4 2,358.8 3,498.9
Operating revenues 663.7 594.8 494.3
Long-lived assets 74.7 54.2 40.7
South America      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenues 564.0 455.0 271.4
Operating revenues 177.5 141.8 127.0
Long-lived assets 6.8 5.6 4.4
Middle East and Asia      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenues 120,922.7 91,015.0 51,023.6
Operating revenues 236.7 159.9 127.6
Long-lived assets 6.6 7.1 2.4
Other      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenues 23.6 32.7 44.8
Operating revenues 35.4 32.7 44.8
Long-lived assets $ 1.0 $ 0.0 $ 0.0