| Revenue | — | — | — |
| Total revenue | 15.7a | 13.38a | 12.48a |
| Expenses | — | — | — |
| Compensation and benefits | -8.28a | -6.9a | -6.48a |
| Information technology | -0.54a | -0.53a | -0.51a |
| Premises | -0.33a | -0.29a | -0.29a |
| Depreciation of fixed assets | -0.18a | -0.17a | -0.15a |
| Amortization and impairment of intangible assets | -0.5a | -0.09a | -0.11a |
| Other general expense | -1.64a | -1.47a | -1.27a |
| Accelerating Aon United Program expenses | -0.39a | -0.14a | |
| Total operating expenses | -11.86a | -9.59a | -8.81a |
| Operating income | 3.84a | 3.79a | 3.67a |
| Interest income | 0.07a | 0.03a | 0.02a |
| Interest expense | -0.79a | -0.48a | -0.41a |
| Other income (expense) | 0.35a | -0.16a | -0.13a |
| Income before income taxes | 3.46a | 3.17a | 3.16a |
| Income tax expense | -0.74a | -0.54a | -0.51a |
| Net income | 2.72a | 2.63a | 2.65a |
| Less: net income attributable to redeemable and nonredeemable noncontrolling interests | 0.07a | 0.06a | 0.06a |
| Net income attributable to Aon shareholders | 2.65a | 2.56a | 2.59a |