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Supplementary Data (Notes) | 3 Months Ended
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Mar. 31, 2018
Supplementary Data [Abstract] |
Accrued Liabilities | Accrued Liabilities The following table presents the components of accrued liabilities.
| March 31, 2018 |  | December 31, 2017
Salaries, benefits and related expenses | $ | 300.1 |  |  | $ | 441.7 |
Office and related expenses | 51.9 |  |  | 53.2 |
Acquisition obligations | 43.4 |  |  | 42.0 |
Interest | 14.6 |  |  | 16.4 |
Other | 118.1 |  |  | 121.4 |
Total accrued liabilities | $ | 528.1 |  |  | $ | 674.7 |
Other Income, Net | Other (Expense) Income, Net Results of operations for the three months ended March 31, 2018 and 2017 include certain items that are not directly associated with our revenue-producing operations.
| Three months ended March 31,
| 2018 |  | 2017
Net (losses) gains on sales of businesses | $ | (24.4 | ) |  | $ | 0.9 |
Other | 0.0 |  |  | (0.1 | )
Total other (expense) income, net | $ | (24.4 | ) |  | $ | 0.8 |
Net (losses) gains on sales of businesses – During the three months ended March 31, 2018, the amounts recognized were related to sales of businesses and the classification of certain assets and liabilities, consisting primarily of cash, accounts receivable and accounts payable, as held for sale within our IAN operating segment.
Share Repurchase Program | Share Repurchase Program In February 2018, our Board of Directors (the "Board") authorized a new share repurchase program to repurchase from time to time up to $300.0, excluding fees, of our common stock, which was in addition to the remaining amount available to be repurchased from the $300.0 authorization made by the Board in February 2017. We may effect such repurchases through open market purchases, trading plans established in accordance with SEC rules, derivative transactions or other means. We expect to continue to repurchase our common stock in future periods, although the timing and amount of the repurchases will depend on market conditions and other funding requirements. The following table presents our share repurchase activity under our share repurchase programs for the three months ended March 31, 2018 and 2017.
| Three months ended March 31,
| 2018 |  | 2017
Number of shares repurchased | 2.4 |  |  | 2.3 |
Aggregate cost, including fees | $ | 54.9 |  |  | $ | 55.0 |
Average price per share, including fees | $ | 22.59 |  |  | $ | 23.85 |
As of March 31, 2018, $400.6, excluding fees, remains available for repurchase under the share repurchase programs. The share repurchase programs have no expiration date.
Redeemable Noncontrolling Interest | Redeemable Noncontrolling Interests Many of our acquisitions include provisions under which the noncontrolling equity owners may require us to purchase additional interests in a subsidiary at their discretion. Redeemable noncontrolling interests are adjusted quarterly to their estimated redemption value, but not less than their initial fair value. Any adjustments to the redemption value impact retained earnings, except for foreign currency translation adjustments. The following table presents changes in our redeemable noncontrolling interests.
| Three months ended March 31,
| 2018 |  | 2017
Balance at beginning of period | $ | 252.1 |  |  | $ | 252.8 |
Change in related noncontrolling interests balance | (2.8 | ) |  | (4.5 | )
Changes in redemption value of redeemable noncontrolling interests: |  |  |
Redemptions and other | (1.9 | ) |  | (12.7 | )
Redemption value adjustments | (0.5 | ) |  | 5.6 |
Balance at end of period | $ | 246.9 |  |  | $ | 241.2 |

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