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Supplementary Data (Notes) | 12 Months Ended
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Dec. 31, 2016
Supplementary Data [Abstract] |
Supplementary Data | Supplementary Data Valuation and Qualifying Accounts – Allowance for Uncollectible Accounts Receivable
| Years ended December 31,
| 2016 |  | 2015 |  | 2014
Balance at beginning of period | $ | 54.2 |  |  | $ | 59.5 |  |  | $ | 64.9 |
Charges to costs and expenses | 16.7 |  |  | 11.4 |  |  | 7.4 |
Deductions: |  |  |  |  |
Dispositions | (2.5 | ) |  | (2.8 | ) |  | 0.1 |
Uncollectible accounts written off | (9.4 | ) |  | (9.8 | ) |  | (8.1 | )
Foreign currency translation adjustment | (3.3 | ) |  | (4.1 | ) |  | (4.8 | )
Balance at end of period | $ | 55.7 |  |  | $ | 54.2 |  |  | $ | 59.5 |
Property and Equipment
|  | December 31,
|  | 2016 |  | 2015
Furniture and equipment |  | $ | 604.2 |  |  | $ | 585.1 |
Leasehold improvements |  | 599.8 |  |  | 570.1 |
Internal use computer software |  | 306.5 |  |  | 295.2 |
Land and buildings |  | 73.1 |  |  | 78.7 |
|  | 1,583.6 |  |  | 1,529.1 |
Less: accumulated depreciation |  | (961.6 | ) |  | (961.9 | )
Total property and equipment, net |  | $ | 622.0 |  |  | $ | 567.2 |
The total depreciation and amortization expense for property and equipment for the years ended December 31, 2016, 2015 and 2014 was $138.3, $130.9 and $133.7, respectively. Accrued Liabilities The following table presents the components of accrued liabilities.
| December 31,
| 2016 |  | 2015
Salaries, benefits and related expenses | $ | 499.0 |  |  | $ | 502.4 |
Office and related expenses | 46.7 |  |  | 51.0 |
Acquisition obligations | 77.5 |  |  | 50.1 |
Interest | 17.3 |  |  | 17.3 |
Other | 153.5 |  |  | 127.6 |
Total accrued liabilities | $ | 794.0 |  |  | $ | 748.4 |
Other Expense, net Results of operations include certain items that are not directly associated with our revenue-producing operations.
| Years ended December 31,
| 2016 |  | 2015 |  | 2014
(Losses) gains on sales of businesses and investments, net | $ | (39.7 | ) |  | $ | (49.6 | ) |  | $ | 0.8 |
Loss on early extinguishment of debt | 0.0 |  |  | 0.0 |  |  | (10.4 | )
Other income (expense), net | 2.4 |  |  | 2.9 |  |  | (0.6 | )
Total other expense, net | $ | (37.3 | ) |  | $ | (46.7 | ) |  | $ | (10.2 | )
(Losses) Gains on Sales of Businesses and Investments, net – During 2016, the amounts recognized are related to the sales of businesses and the classification of certain assets and liabilities, consisting primarily of accounts receivable and accounts payable, respectively, as held for sale within both our IAN and CMG segments. During 2015, the amounts recognized are related to the sales of businesses within both our IAN and CMG segments and the classification of certain assets and liabilities, consisting primarily of accounts receivable and accounts payable, respectively, as held for sale within our IAN segment. The businesses held for sale as of each year end primarily represent unprofitable, non-strategic agencies which are expected to be sold within the next twelve months. Loss on Early Extinguishment of Debt – During 2014, we recorded a charge of $10.4 related to the redemption of our 6.25% Senior Unsecured Notes due 2014. Share Repurchase Program In February 2014, 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 (the "2014 Share Repurchase Program"). In February 2015, the Board authorized a new share repurchase program to repurchase from time to time up to $300.0, excluding fees, of our common stock (the "2015 Share Repurchase Program"). In February 2016, the Board authorized a new share repurchase program to repurchase from time to time up to $300.0, excluding fees, of our common stock (the "2016 Share Repurchase Program"). 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.
| Years ended December 31,
| 2016 |  | 2015 |  | 2014
Number of shares repurchased | 13.3 |  |  | 13.6 |  |  | 14.9 |
Aggregate cost, including fees | $ | 303.3 |  |  | $ | 285.2 |  |  | $ | 275.1 |
Average price per share, including fees | $ | 22.76 |  |  | $ | 20.97 |  |  | $ | 18.41 |
We fully utilized the 2014 Share Repurchase Program in the third quarter of 2015 and the 2015 Share Repurchase Program in the third quarter of 2016. As of December 31, 2016, $155.4 remained available for repurchase under the 2016 Share Repurchase Program. The 2016 Share Repurchase Program has no expiration date. Supplemental Cash Flow Information
| Years ended December 31,
| 2016 |  | 2015 |  | 2014
Cash paid for interest | $ | 78.8 |  |  | $ | 74.5 |  |  | $ | 78.1 |
Cash paid for income taxes, net of refunds 1 | 244.1 |  |  | 231.9 |  |  | 103.9 |
1 | Refunds of $26.6, $13.0 and $21.3 were received for the years ended December 31, 2016, 2015 and 2014, respectively.

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