Revenue Recognition (Tables)

3 Months Ended

Dec. 31, 2021

Revenue Recognition

Schedule of revenues disaggregated by revenue sources

	Three months ended
	December 31,		December 31,
	2021		2020
	(in millions)
Cost reimbursable	$	1,307.6	$	1,327.4
Guaranteed maximum price		1,067.7		1,197.9
Fixed price		891.4		787.9
Total revenue	$	3,266.7	$	3,313.2

	Three months ended
	December 31,		December 31,
	2021		2020
	(in millions)
Americas	$	2,464.2	$	2,557.5
Europe, Middle East, India, Africa		440.9		414.7
Asia Pacific		361.6		341.0
Total revenue	$	3,266.7	$	3,313.2

Schedule of net accounts receivable

	December 31,		September 30,
	2021		2021
	(in millions)
Billed	$	2,163.5	$	2,181.1
Contract retentions		506.6		531.2
Total accounts receivable—gross		2,670.1		2,712.3
Allowance for doubtful accounts and credit losses		(88.4)		(92.8)
Total accounts receivable—net	$	2,581.7	$	2,619.5