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Supplementary Data (Tables) | 9 Months Ended
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Sep. 30, 2018
Supplementary Data [Abstract] |
Accrued Liabilities | The following table presents the components of accrued liabilities.
| September 30, 2018 |  | December 31, 2017
Salaries, benefits and related expenses | $ | 340.1 |  |  | $ | 441.7 |
Acquisition obligations | 52.3 |  |  | 42.0 |
Office and related expenses | 49.4 |  |  | 53.2 |
Interest | 19.0 |  |  | 16.4 |
Other | 110.2 |  |  | 121.4 |
Total accrued liabilities | $ | 571.0 |  |  | $ | 674.7 |
Other Income (Expense), Net | Results of operations for the three and nine months ended September 30, 2018 and 2017 include certain items that are not directly associated with our revenue-producing operations.
| Three months ended September 30, |  | Nine months ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Net losses on sales of businesses | $ | (5.8 | ) |  | $ | (8.7 | ) |  | $ | (50.0 | ) |  | $ | (20.9 | )
Other | (9.5 | ) |  | (1.2 | ) |  | (6.0 | ) |  | (3.6 | )
Total other expense, net | $ | (15.3 | ) |  | $ | (9.9 | ) |  | $ | (56.0 | ) |  | $ | (24.5 | )
Share Repurchase Program | The following table presents our share repurchase activity under our share repurchase programs for the nine months ended September 30, 2018 and 2017.
| Nine months ended September 30,
| 2018 |  | 2017
Number of shares repurchased | 5.1 |  |  | 9.4 |
Aggregate cost, including fees | $ | 117.1 |  |  | $ | 216.0 |
Average price per share, including fees | $ | 23.03 |  |  | $ | 22.92 |

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