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Revenue Recognition (Tables)
6 Months Ended
Mar. 31, 2024
Revenue Recognition.  
Schedule of revenues disaggregated by revenue sources

Three months ended

Six months ended

March 31, 

March 31, 

March 31, 

March 31, 

    

2024

    

2023

    

2024

    

2023

    

(in millions)

Cost reimbursable

$

1,605.1

$

1,511.3

$

3,222.3

$

3,026.2

Guaranteed maximum price

1,420.7

1,151.0

2,835.6

2,239.2

Fixed-price

918.1

827.8

1,785.9

1,607.1

Total revenue

$

3,943.9

$

3,490.1

$

7,843.8

$

6,872.5

Three months ended

Six months ended

March 31, 

March 31, 

March 31, 

March 31, 

    

2024

    

2023

    

2024

    

2023

    

(in millions)

Americas

$

3,039.1

$

2,630.3

$

6,077.9

$

5,209.9

Europe, Middle East, India, Africa

619.8

494.1

1,115.2

942.1

Asia-Australia-Pacific

285.0

365.7

650.7

720.5

Total revenue

$

3,943.9

$

3,490.1

$

7,843.8

$

6,872.5

Schedule of net accounts receivable

    

March 31, 

September 30, 

2024

    

2023

(in millions)

Billed

$

2,125.4

$

2,122.2

Contract retentions

 

602.8

516.5

Total accounts receivable—gross

 

2,728.2

2,638.7

Allowance for doubtful accounts and credit losses

 

(81.5)

(94.2)

Total accounts receivable—net

$

2,646.7

$

2,544.5