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Supplementary Data (Tables) | 6 Months Ended
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Jun. 30, 2018
Supplementary Data [Abstract] |
Accrued Liabilities | The following table presents the components of accrued liabilities.
| June 30, 2018 |  | December 31, 2017
Salaries, benefits and related expenses | $ | 310.7 |  |  | $ | 441.7 |
Acquisition obligations | 65.7 |  |  | 42.0 |
Office and related expenses | 48.8 |  |  | 53.2 |
Interest | 16.9 |  |  | 16.4 |
Other | 109.4 |  |  | 121.4 |
Total accrued liabilities | $ | 551.5 |  |  | $ | 674.7 |
Other Income (Expense), Net | Results of operations for the three and six months ended June 30, 2018 and 2017 include certain items that are not directly associated with our revenue-producing operations.
| Three months ended June 30, |  | Six months ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Net losses on sales of businesses | $ | (19.8 | ) |  | $ | (13.1 | ) |  | $ | (44.2 | ) |  | $ | (12.2 | )
Other | 3.5 |  |  | (2.3 | ) |  | 3.5 |  |  | (2.4 | )
Total other expense, net | $ | (16.3 | ) |  | $ | (15.4 | ) |  | $ | (40.7 | ) |  | $ | (14.6 | )
Share Repurchase Program | The following table presents our share repurchase activity under our share repurchase programs for the six months ended June 30, 2018 and 2017.
| Six months ended June 30,
| 2018 |  | 2017
Number of shares repurchased | 5.0 |  |  | 4.8 |
Aggregate cost, including fees | $ | 114.5 |  |  | $ | 115.0 |
Average price per share, including fees | $ | 23.02 |  |  | $ | 24.13 |

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