| Revenues | — | — | — |
| Revenues before reimbursements | 518.49a | 497.19a | 463.82a |
| Reimbursements | 40.02a | 39.58a | 49.47a |
| Revenues | 558.51a | 536.77a | 513.29a |
| Operating expenses | — | — | — |
| Compensation and related expenses | -330.01a | -319.89a | -264.24a |
| Other operating expenses | -46.2a | -41.54a | -35.08a |
| Reimbursable expenses | -40.02a | -39.58a | -49.47a |
| General and administrative expenses | -22.73a | -24.44a | -23.66a |
| Total operating expenses | -438.96a | -425.44a | -372.45a |
| Operating income | 119.56a | 111.32a | 140.84a |
| Other income | — | — | — |
| Interest income | 10a | 7.15a | 2.1a |
| Miscellaneous income, net | 17.81a | 17.42a | -10.7a |
| Income before income taxes | 147.37a | 135.9a | 132.23a |
| Provision for income taxes | -38.37a | -35.56a | -29.9a |
| Net income | 109a | 100.34a | 102.33a |