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Supplementary Data (Tables) | 6 Months Ended
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Jun. 30, 2017
Supplementary Data [Abstract] |
Accrued Liabilities | The following table presents the components of accrued liabilities.
| June 30, 2017 |  | December 31, 2016
Salaries, benefits and related expenses | $ | 301.4 |  |  | $ | 499.0 |
Acquisition obligations | 56.8 |  |  | 77.5 |
Office and related expenses | 45.4 |  |  | 46.7 |
Interest | 17.1 |  |  | 17.3 |
Other | 92.4 |  |  | 153.5 |
Total accrued liabilities | $ | 513.1 |  |  | $ | 794.0 |
Other Income (Expense), Net | Results of operations for the three and six months ended June 30, 2017 and 2016 include certain items that are not directly associated with our revenue-producing operations.
| Three months ended June 30, |  | Six months ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Net losses on sales of businesses and investments | $ | (13.1 | ) |  | $ | (2.2 | ) |  | $ | (12.1 | ) |  | $ | (18.5 | )
Other (expense) income, net | (2.3 | ) |  | 2.6 |  |  | (2.5 | ) |  | (0.3 | )
Total other (expense) income, net | $ | (15.4 | ) |  | $ | 0.4 |  |  | $ | (14.6 | ) |  | $ | (18.8 | )
Share Repurchase Program | The following table presents our share repurchase activity under our share repurchase programs for the six months ended June 30, 2017 and 2016.
| Six months ended June 30,
| 2017 |  | 2016
Number of shares repurchased | 4.8 |  |  | 5.0 |
Aggregate cost, including fees | $ | 115.0 |  |  | $ | 112.5 |
Average price per share, including fees | $ | 24.13 |  |  | $ | 22.47 |

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