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Supplementary Data (Tables) | 9 Months Ended
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Sep. 30, 2017
Supplementary Data [Abstract] |
Accrued Liabilities | The following table presents the components of accrued liabilities.
| September 30, 2017 |  | December 31, 2016
Salaries, benefits and related expenses | $ | 341.3 |  |  | $ | 499.0 |
Acquisition obligations | 53.2 |  |  | 77.5 |
Office and related expenses | 48.8 |  |  | 46.7 |
Interest | 17.0 |  |  | 17.3 |
Other | 90.4 |  |  | 153.5 |
Total accrued liabilities | $ | 550.7 |  |  | $ | 794.0 |
Other (Expense) Income, Net | Results of operations for the three and nine months ended September 30, 2017 and 2016 include certain items that are not directly associated with our revenue-producing operations.
| Three months ended September 30, |  | Nine months ended September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Net (losses) gains on sales of businesses and investments | $ | (6.2 | ) |  | $ | 3.9 |  |  | $ | (18.3 | ) |  | $ | (14.6 | )
Other (expense) income, net | (3.7 | ) |  | 1.4 |  |  | (6.2 | ) |  | 1.1 |
Total other (expense) income, net | $ | (9.9 | ) |  | $ | 5.3 |  |  | $ | (24.5 | ) |  | $ | (13.5 | )
Share Repurchase Program | The following table presents our share repurchase activity under our share repurchase programs for the nine months ended September 30, 2017 and 2016.
| Nine months ended September 30,
| 2017 |  | 2016
Number of shares repurchased | 9.4 |  |  | 8.5 |
Aggregate cost, including fees | $ | 216.0 |  |  | $ | 193.3 |
Average price per share, including fees | $ | 22.92 |  |  | $ | 22.69 |

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