Segment and Geographic Information - Total Revenues by Geographic Location (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Total revenues:	$ 66,036.0	$ 42,534.2	$ 54,139.6
Operating revenues:	2,107.4	1,673.1	1,308.3
Long-lived assets, as defined:	112.9	93.3	62.1
United States
Total revenues:	5,102.3	3,313.1	2,223.3
Operating revenues:	1,448.2	1,157.4	928.3
Long-lived assets, as defined:	67.9	54.1	55.4
Europe
Total revenues:	3,440.2	1,889.6	532.6
Operating revenues:	474.6	371.3	237.9
Long-lived assets, as defined:	41.1	36.0	3.1
South America
Total revenues:	87.2	64.5	58.9
Operating revenues:	87.2	64.5	58.9
Long-lived assets, as defined:	2.9	2.1	2.1
Middle East and Asia
Total revenues:	57,395.5	37,259.1	51,317.1
Operating revenues:	86.6	72.0	75.5
Long-lived assets, as defined:	1.0	0.9	1.3
Other
Total revenues:	10.8	7.9	7.7
Operating revenues:	10.8	7.9	7.7
Long-lived assets, as defined:	$ 0.0	$ 0.2	$ 0.2