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Supplemental Disclosures (Tables) | 12 Months Ended
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Dec. 31, 2017
Supplemental Cash Flow Information [Abstract] |
Additional information concerning acquisitions, interest and income taxes paid | The following schedule provides additional information concerning acquisitions, interest and income taxes paid:
(In millions of dollars) | 2017 |  |  | 2016 |  |  | 2015 |
Assets acquired, excluding cash | $ | 898 |  |  | $ | 960 |  |  | $ | 1,327 |
Liabilities assumed | (134 | ) |  | (111 | ) |  | (199 | )
Contingent/deferred purchase consideration | (109 | ) |  | (36 | ) |  | (176 | )
Net cash outflow for acquisitions | $ | 655 |  |  | $ | 813 |  |  | $ | 952 |
(In millions of dollars) | 2017 |  |  | 2016 |  |  | 2015 |
Interest paid | $ | 199 |  |  | $ | 178 |  |  | $ | 146 |
Income taxes paid, net of refunds | $ | 583 |  |  | $ | 642 |  |  | $ | 433 |
Analysis of allowance for doubtful accounts | An analysis of the allowance for doubtful accounts is as follows:
For the Years Ended December 31,
(In millions of dollars) | 2017 |  |  | 2016 |  |  | 2015 |
Balance at beginning of year | $ | 96 |  |  | $ | 87 |  |  | $ | 95 |
Provision charged to operations | 31 |  |  | 31 |  |  | 14 |
Accounts written-off, net of recoveries | (17 | ) |  | (20 | ) |  | (18 | )
Effect of exchange rate changes and other | — |  |  | (2 | ) |  | (4 | )
Balance at end of year | $ | 110 |  |  | $ | 96 |  |  | $ | 87 |

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