| Revenue, net | 2,109.05a | 1,885.84a | 1,460a |
| Operating expenses | — | — | — |
| Direct service costs, excluding depreciation and amortization | -682.1a | -638.25a | -534.89a |
| Reimbursed out-of-pocket expenses | -770.65a | -723.09a | -492.67a |
| Total direct costs | -1,452.75a | -1,361.34a | -1,027.56a |
| Selling, general and administrative | -180.18a | -161.35a | -131.4a |
| Depreciation | -27.81a | -24.13a | -18.99a |
| Amortization | -1.44a | -2.2a | -3.35a |
| Total operating expenses | -1,662.18a | -1,549.02a | -1,181.3a |
| Income from operations | 446.87a | 336.83a | 278.7a |
| Other income (expense), net | — | — | — |
| Miscellaneous income (expense), net | 4.06a | -0.66a | 7.07a |
| Interest income (expense), net | 25a | -0.49a | -2.91a |
| Total other income (expense), net | 29.05a | -1.14a | 4.16a |
| Income before income taxes | 475.92a | 335.68a | 282.86a |
| Income tax provision | -71.54a | -52.87a | -37.49a |
| Net income | 404.39a | 282.81a | 245.37a |