| Schedule of revenues disaggregated by revenue sources |
| | | | | | | | | | | | | | | Three months ended | | Nine months ended | | | June 30, | | June 30, | | June 30, | | June 30, | | | 2024 | | 2023 | | 2024 | | 2023 | | | | (in millions) | Cost reimbursable | | $ | 1,594.7 | | $ | 1,500.2 | | $ | 4,817.0 | | $ | 4,526.4 | Guaranteed maximum price | | | 1,597.5 | | | 1,325.5 | | | 4,433.1 | | | 3,564.7 | Fixed-price | | | 959.0 | | | 837.9 | | | 2,744.9 | | | 2,445.0 | Total revenue | | $ | 4,151.2 | | $ | 3,663.6 | | $ | 11,995.0 | | $ | 10,536.1 |
| | | | | | | | | | | | | | | Three months ended | | Nine months ended | | | June 30, | | June 30, | | June 30, | | June 30, | | | 2024 | | 2023 | | 2024 | | 2023 | | | | (in millions) | Americas | | $ | 3,247.0 | | $ | 2,829.4 | | $ | 9,325.0 | | $ | 8,039.3 | Europe, Middle East, India, Africa | | | 530.1 | | | 476.0 | | | 1,645.3 | | | 1,418.1 | Asia-Australia-Pacific | | | 374.1 | | | 358.2 | | | 1,024.7 | | | 1,078.7 | Total revenue | | $ | 4,151.2 | | $ | 3,663.6 | | $ | 11,995.0 | | $ | 10,536.1 |
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| Schedule of net accounts receivable |
| | | | | | | | | June 30, | | September 30, | | | 2024 | | 2023 | | | | (in millions) | Billed | | $ | 2,101.5 | | $ | 2,122.2 | Contract retentions | | | 644.8 | | | 516.5 | Total accounts receivable—gross | | | 2,746.3 | | | 2,638.7 | Allowance for doubtful accounts and credit losses | | | (85.9) | | | (94.2) | Total accounts receivable—net | | $ | 2,660.4 | | $ | 2,544.5 |
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