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Supplementary Data (Notes) | 12 Months Ended
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Dec. 31, 2018
Supplementary Data [Abstract] |
Supplementary Data | Supplementary Data Valuation and Qualifying Accounts – Allowance for Uncollectible Accounts Receivable
| Years ended December 31,
| 2018 |  | 2017 |  | 2016
Balance at beginning of period | $ | 42.7 |  |  | $ | 55.7 |  |  | $ | 54.2 |
Charges to costs and expenses | 6.5 |  |  | 9.5 |  |  | 16.7 |
Adjustments: |  |  |  |  |
Acquisitions/(dispositions) | 2.2 |  |  | (1.0 | ) |  | (2.5 | )
Uncollectible accounts written off | (7.1 | ) |  | (25.5 | ) |  | (9.4 | )
Foreign currency translation adjustments | (1.8 | ) |  | 4.0 |  |  | (3.3 | )
Balance at end of period | $ | 42.5 |  |  | $ | 42.7 |  |  | $ | 55.7 |
Property and Equipment
|  | December 31,
|  | 2018 |  | 2017
Furniture and equipment |  | $ | 681.7 |  |  | $ | 634.8 |
Leasehold improvements |  | 629.0 |  |  | 641.5 |
Internal-use computer software |  | 368.5 |  |  | 331.3 |
Land and buildings |  | 146.6 |  |  | 79.0 |
Gross property and equipment |  | 1,825.8 |  |  | 1,686.6 |
Less: accumulated depreciation |  | (1,034.9 | ) |  | (1,036.2 | )
Total property and equipment, net |  | $ | 790.9 |  |  | $ | 650.4 |
Total depreciation and amortization expense for property and equipment for the years ended December 31, 2018, 2017 and 2016 was $165.3, $136.0 and $138.3, respectively. Accrued Liabilities The following table presents the components of accrued liabilities.
| December 31,
| 2018 |  | 2017
Salaries, benefits and related expenses | $ | 494.9 |  |  | $ | 441.7 |
Acquisition obligations | 65.7 |  |  | 42.0 |
Office and related expenses | 52.2 |  |  | 53.2 |
Interest | 43.6 |  |  | 16.4 |
Other | 150.5 |  |  | 121.4 |
Total accrued liabilities | $ | 806.9 |  |  | $ | 674.7 |
Other Expense, Net Results of operations include certain items that are not directly associated with our revenue-producing operations.
| Years ended December 31,
| 2018 |  | 2017 |  | 2016
Net losses on sales of businesses | $ | (61.9 | ) |  | $ | (24.1 | ) |  | $ | (41.4 | )
Other | (7.7 | ) |  | (2.1 | ) |  | 1.1 |
Total other expense, net | $ | (69.6 | ) |  | $ | (26.2 | ) |  | $ | (40.3 | )
Net losses on sales of businesses – During 2018, the amounts recognized were related to sales of businesses and the classification of certain assets and liabilities, consisting primarily of cash, as held for sale within our IAN and CMG reportable segments. The businesses held for sale as of year end primarily represent unprofitable, non-strategic agencies which are expected to be sold within the next twelve months. During 2017, 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 reportable segment. During 2016, the amounts recognized were related to sales of businesses and the classification of certain assets and liabilities, consisting primarily of accounts receivable and accounts payable, as held for sale within both our IAN and CMG reportable segments. Other – During 2018, the amounts recognized were primarily a result of transaction-related costs from the Acxiom Acquisition. 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. The timing and amount of repurchases in future periods 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,
| 2018 |  | 2017 |  | 2016
Number of shares repurchased | 5.1 |  |  | 13.7 |  |  | 13.3 |
Aggregate cost, including fees | $ | 117.1 |  |  | $ | 300.1 |  |  | $ | 303.3 |
Average price per share, including fees | $ | 23.03 |  |  | $ | 21.97 |  |  | $ | 22.76 |
On July 2, 2018, in connection with the announcement of the Acxiom acquisition, we announced that share repurchases will be suspended for a period of time in order to reduce the increased debt levels incurred in conjunction with the acquisition. As of December 31, 2018, $338.4 remained available for repurchase under the share repurchase programs, which has no expiration date. Supplemental Cash Flow Information
| Years ended December 31,
| 2018 |  | 2017 |  | 2016
Cash paid for interest | $ | 88.7 |  |  | $ | 82.3 |  |  | $ | 78.8 |
Cash paid for income taxes, net of refunds 1 | 207.9 |  |  | 228.4 |  |  | 244.1 |
1 | Refunds of $24.3, $31.9 and $26.6 were received for the years ended December 31, 2018, 2017 and 2016, respectively.

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