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Shareholders' Equity | 9 Months Ended
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Sep. 30, 2025
Equity [Abstract] |
Shareholders' Equity | Shareholders’ Equity Ordinary Shares Aon has a share repurchase program authorized by the Company’s Board of Directors (“the Repurchase Program”). The Repurchase Program was established in April 2012 with $5.0 billion in authorized repurchases, and was increased by $5.0 billion in authorized repurchases in each of November 2014, June 2017, and November 2020, and by $7.5 billion in February 2022 for a total of $27.5 billion in repurchase authorizations. Under the Repurchase Program, the Company’s class A ordinary shares may be repurchased through the open market or in privately negotiated transactions, from time to time, based on prevailing market conditions, and will be funded from available capital. The following table summarizes the Company’s share repurchase activity (in millions, except per share data):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Shares repurchased | 0.7 |  |  | 0.9 |  |  | 2.0 |  |  | 2.5 |
Average price per share | $ | 362.00 |  |  | $ | 339.31 |  |  | $ | 371.71 |  |  | $ | 316.57 |
Repurchase costs recorded to accumulated deficit | $ | 250 |  |  | $ | 304 |  |  | $ | 750 |  |  | $ | 804 |
At September 30, 2025, the remaining authorized amount for share repurchases under the Repurchase Program was approximately $1.6 billion. Under the Repurchase Program, the Company has repurchased a total of 174.2 million shares for an aggregate cost of approximately $25.9 billion. Weighted Average Ordinary Shares Weighted average ordinary shares outstanding are as follows (in millions):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Basic weighted average ordinary shares outstanding | 215.7 |  |  | 217.4 |  |  | 216.1 |  |  | 209.7 |
Dilutive effect of potentially issuable shares | 1.0 |  |  | 1.0 |  |  | 1.2 |  |  | 0.9 |
Diluted weighted average ordinary shares outstanding | 216.7 |  |  | 218.4 |  |  | 217.3 |  |  | 210.6 |
Potentially issuable shares are not included in the computation of Diluted net income per share attributable to Aon shareholders if their inclusion would be antidilutive. There were an insignificant number of shares excluded from the calculation for the three and nine months ended September 30, 2025. There were no shares and 0.1 million shares excluded from the calculation for the three and nine months ended September 30, 2024. Accumulated Other Comprehensive Loss Changes in Accumulated other comprehensive loss by component, net of related tax, are as follows (in millions):
| Change in Fair Value of Financial Instruments (1) |  | Foreign Currency Translation Adjustments |  | Postretirement Benefit Obligation (2) |  | Total
Balance at January 1, 2025 | $ | 74 |  |  | $ | (2,051) |  |  | $ | (2,768) |  |  | $ | (4,745) |
Other comprehensive income (loss) before reclassifications, net | 10 |  |  | 752 |  |  | (8) |  |  | 754 |
Amounts reclassified from accumulated other comprehensive income |  |  |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) | (8) |  |  | — |  |  | 110 |  |  | 102 |
Tax expense | 2 |  |  | — |  |  | (28) |  |  | (26) |
Amounts reclassified from accumulated other comprehensive income (loss), net | (6) |  |  | — |  |  | 82 |  |  | 76 |
Net current period other comprehensive income (loss) | 4 |  |  | 752 |  |  | 74 |  |  | 830 |
Balance at September 30, 2025 | $ | 78 |  |  | $ | (1,299) |  |  | $ | (2,694) |  |  | $ | (3,915) |
| Change in Fair Value of Financial Instruments (1) |  | Foreign Currency Translation Adjustments |  | Postretirement Benefit Obligation (2) |  | Total
Balance at January 1, 2024 | $ | 2 |  |  | $ | (1,584) |  |  | $ | (2,791) |  |  | $ | (4,373) |
Other comprehensive income (loss) before reclassifications, net | 85 |  |  | 129 |  |  | (40) |  |  | 174 |
Amounts reclassified from accumulated other comprehensive income |  |  |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income | (1) |  |  | — |  |  | 106 |  |  | 105 |
Tax expense | — |  |  | — |  |  | (27) |  |  | (27) |
Amounts reclassified from accumulated other comprehensive income, net | (1) |  |  | — |  |  | 79 |  |  | 78 |
Net current period other comprehensive income (loss) | 84 |  |  | 129 |  |  | 39 |  |  | 252 |
Balance at September 30, 2024 | $ | 86 |  |  | $ | (1,455) |  |  | $ | (2,752) |  |  | $ | (4,121) |
(1)Reclassifications from this category included in Accumulated other comprehensive loss are recorded in Total revenue, Interest expense, and Compensation and benefits in the Condensed Consolidated Statements of Income. Refer to Note 13 “Derivatives and Hedging” for further information regarding the Company’s derivative and hedging activity. (2)Reclassifications from this category included in Accumulated other comprehensive loss are recorded in Other income (expense) in the Condensed Consolidated Statements of Income.

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