| 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 |
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| 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 |
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