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Revenue Recognition (Tables)
12 Months Ended
Sep. 30, 2023
Revenue Recognition.  
Schedule of revenues disaggregated by revenue sources

Fiscal Year Ended

September 30, 

September 30, 

September 30, 

    

2023

    

2022

    

2021

    

(in millions)

Cost reimbursable

$

6,128.8

$

5,454.9

$

5,319.4

Guaranteed maximum price

4,887.7

 

4,325.0

 

4,582.7

Fixed price

3,362.0

 

3,368.3

 

3,438.8

Total revenue

$

14,378.5

$

13,148.2

$

13,340.9

Fiscal Year Ended

September 30, 

September 30, 

September 30, 

    

2023

    

2022

    

2021

    

(in millions)

Americas

$

10,976.4

$

9,941.6

$

10,228.3

Europe, Middle East, India, Africa

1,937.3

 

1,759.8

 

1,691.3

Asia-Australia-Pacific

1,464.8

 

1,446.8

 

1,421.3

Total revenue

$

14,378.5

$

13,148.2

$

13,340.9

Schedule of net accounts receivable

Fiscal Year Ended

    

September 30, 

September 30, 

2023

    

2022

(in millions)

Billed

$

2,122.2

$

1,931.4

Contract retentions

 

516.5

490.4

Total accounts receivable—gross

 

2,638.7

2,421.8

Allowance for doubtful accounts and credit losses

 

(94.2)

(104.0)

Total accounts receivable—net

$

2,544.5

$

2,317.8