Exhibit 12.1
Aon Corporation and Consolidated Subsidiaries
Combined With Unconsolidated Subsidiaries
Computation of Ratio of Earnings to Fixed Charges
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| Nine Months ended |
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| September 30, |
| Years Ended December 31, |
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(millions except ratio) |
| 2011 |
| 2010 |
| 2010 |
| 2009 |
| 2008 |
| 2007 |
| 2006 |
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Income from continuing operations before income taxes and noncontrolling interests |
| $ | 1,000 |
| $ | 699 |
| $ | 1,059 |
| $ | 949 |
| $ | 879 |
| $ | 1,023 |
| $ | 738 |
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Less: Equity in earnings on less than 50% owned entities |
| (7 | ) | 3 |
| 10 |
| 11 |
| 5 |
| 6 |
| 5 |
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Add back fixed charges: |
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Interest on indebtedness |
| 186 |
| 117 |
| 182 |
| 122 |
| 126 |
| 138 |
| 129 |
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Interest on uncertain tax positions |
| 1 |
| 1 |
| (1 | ) | 2 |
| — |
| 2 |
| — |
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Portion of rents representative of interest factor |
| 37 |
| 29 |
| 48 |
| 48 |
| 47 |
| 75 |
| 79 |
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Income as adjusted |
| $ | 1,231 |
| $ | 843 |
| $ | 1,278 |
| $ | 1,110 |
| $ | 1,047 |
| $ | 1,232 |
| $ | 941 |
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Fixed charges: |
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Interest on indebtedness |
| $ | 186 |
| $ | 117 |
| $ | 182 |
| $ | 122 |
| $ | 126 |
| $ | 138 |
| $ | 129 |
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Interest on uncertain tax positions |
| 1 |
| 1 |
| (1 | ) | 2 |
| — |
| 2 |
| — |
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Portion of rents representative of interest factor |
| 37 |
| 29 |
| 48 |
| 48 |
| 47 |
| 75 |
| 79 |
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Total fixed charges |
| $ | 224 |
| $ | 147 |
| $ | 229 |
| $ | 172 |
| $ | 173 |
| $ | 215 |
| $ | 208 |
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Ratio of earnings to fixed charges |
| 5.5 |
| 5.7 |
| 5.6 |
| 6.5 |
| 6.1 |
| 5.7 |
| 4.5 |
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