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Trade and Other Receivables | 12 Months Ended
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Dec. 31, 2017
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Trade and Other Receivables | 10. Trade and Other Receivables
|  | December 31 |  |  | December 31 |
|  | 2017 $ |  |  | 2016 $ |
Trade receivables, net of allowance |  |  | 746.6 |  |  |  | 740.7 |
Holdbacks, current |  |  | 43.8 |  |  |  | 45.0 |
Other |  |  | 25.7 |  |  |  | 20.7 |
Trade and other receivables |  |  | 816.1 |  |  |  | 806.4 |
The Company maintains an allowance for estimated losses on trade receivables. The estimate is based on the best assessment of the collectibility of the related receivable balance, which is determined in part based on the age of the outstanding receivables and the Company’s historical collection and loss experience. The following table provides a reconciliation of changes to the Company’s allowance for doubtful accounts.
|  | December 31 2017 $ |  |  | December 31 2016 $ |
Balance, beginning of the year |  |  | 28.2 |  |  |  | 20.9 |
Provision for doubtful accounts |  |  | 11.6 |  |  |  | 17.0 |
Deductions |  |  | (8.7 | ) |  |  | (8.0 | )
Impact of foreign exchange |  |  | (2.0 | ) |  |  | (1.7 | )
Balance, end of the year |  |  | 29.1 |  |  |  | 28.2 |
The aging analysis of gross trade receivables is as follows:
|  | Total |  |  | 1–30 |  |  | 31–60 |  |  | 61–90 |  |  | 91–120 |  |  | 121+ |
|  | $ |  |  | $ |  |  | $ |  |  | $ |  |  | $ |  |  | $ |
December 31, 2017 |  |  | 775.7 |  |  |  | 406.5 |  |  |  | 183.6 |  |  |  | 60.0 |  |  |  | 39.4 |  |  |  | 86.2 |
December 31, 2016 |  |  | 768.9 |  |  |  | 413.6 |  |  |  | 159.5 |  |  |  | 61.7 |  |  |  | 44.1 |  |  |  | 90.0 |

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- Definition The disclosure of trade and other receivables. [Refer: Trade and other receivables] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 10 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_10_e&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Text block1 [abstract] + References No definition available. + Details
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