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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, 2024
Sep. 30, 2023
Sep. 30, 2022
Total revenues $ 99,887.8 $ 60,856.1 $ 66,036.0
Operating revenues 3,436.2 2,914.1 2,107.4
Long-lived assets 143.1 123.5 112.9
United States      
Total revenues 6,026.3 6,017.4 5,102.3
Operating revenues 2,507.0 2,120.4 1,448.2
Long-lived assets 76.2 76.0 67.9
Europe      
Total revenues 2,358.8 3,498.9 3,440.2
Operating revenues 594.8 494.3 474.6
Long-lived assets 54.2 40.7 41.1
South America      
Total revenues 455.0 271.4 87.2
Operating revenues 141.8 127.0 87.2
Long-lived assets 5.6 4.4 2.9
Middle East and Asia      
Total revenues 91,015.0 51,023.6 57,395.5
Operating revenues 159.9 127.6 86.6
Long-lived assets 7.1 2.4 1.0
Other      
Total revenues 32.7 44.8 10.8
Operating revenues 32.7 44.8 10.8
Long-lived assets $ 0.0 $ 0.0 $ 0.0