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Supplemental Disclosures (Tables) | 12 Months Ended
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Dec. 31, 2020
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) | 2020 |  | 2019 |  | 2018
Assets acquired, excluding cash | $ | 929 |  |  | $ | 8,655 |  |  | $ | 1,100 |
Liabilities assumed | (78) |  |  | (2,804) |  |  | (83) |
Non-controlling interests assumed | — |  |  | (280) |  |  | — |
Contingent and deferred purchase consideration | (183) |  |  | (66) |  |  | (133) |
Net cash outflow for acquisitions | $ | 668 |  |  | $ | 5,505 |  |  | $ | 884 |
(In millions of dollars) | 2020 |  | 2019 |  | 2018
Interest paid | $ | 481 |  |  | $ | 427 |  |  | $ | 264 |
Income taxes paid, net of refunds | $ | 673 |  |  | $ | 661 |  |  | $ | 632 |
Analysis of allowance for doubtful accounts | An analysis of the allowance for credit losses for the year ended December 31, 2020 is provided below. Prior periods analysis is based on the Company's allowance for doubtful accounts model prior to adoption of the new accounting guidance discussed above:
For the Years Ended December 31,
(In millions of dollars) | 2020 |  | 2019 |  | 2018
Balance at beginning of year | $ | 140 |  |  | $ | 112 |  |  | $ | 110 |
Provision charged to operations | 47 |  |  | 32 |  |  | 34 |
Accounts written-off, net of recoveries | (30) |  |  | (16) |  |  | (24) |
Effect of exchange rate changes and other | (15) |  |  | 12 |  |  | (8) |
Balance at end of year | $ | 142 |  |  | $ | 140 |  |  | $ | 112 |

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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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