Revenue Recognition (Tables)

6 Months Ended

Mar. 31, 2022

Revenue Recognition

Schedule of revenues disaggregated by revenue sources

	Three months ended				Six months ended
	March 31,		March 31,		March 31,		March 31,
	2022		2021		2022		2021
	(in millions)
Cost reimbursable	$	1,378.9	$	1,405.2	$	2,686.5	$	2,732.6
Guaranteed maximum price		1,004.9		1,015.2		2,072.6		2,213.1
Fixed-price		829.9		845.1		1,721.3		1,633.0
Total revenue	$	3,213.7	$	3,265.5	$	6,480.4	$	6,578.7

	Three months ended				Six months ended
	March 31,		March 31,		March 31,		March 31,
	2022		2021		2022		2021
	(in millions)
Americas	$	2,400.5	$	2,469.1	$	4,864.6	$	5,026.6
Europe, Middle East, India, Africa		457.6		435.4		898.5		850.2
Asia Pacific		355.6		361.0		717.3		701.9
Total revenue	$	3,213.7	$	3,265.5	$	6,480.4	$	6,578.7

Schedule of net accounts receivable

	March 31,		September 30,
	2022		2021
	(in millions)
Billed	$	2,053.9	$	2,181.1
Contract retentions		505.2		531.2
Total accounts receivable—gross		2,559.1		2,712.3
Allowance for doubtful accounts and credit losses		(109.0)		(92.8)
Total accounts receivable—net	$	2,450.1	$	2,619.5