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PROVISIONS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Provisions reconciliation |  |
Provisions at beginning of period | $ 954.4 |
Additions | 15.9 |
Reductions | (35.8) |
Reclamation spending | (42.6) |
Accretion | 31.3 |
Dispositions | (37.6) |
Reclamation expense | 11.4 |
Provisions at end of period | 897.0 | $ 954.4
Current portion | 66.5 |
Non-current portion | 830.5 |
Reclamation and remediation obligations |  |
Provisions reconciliation |  |
Provisions at beginning of period | 908.3 |
Additions | 9.7 |
Reductions | (19.4) |
Reclamation spending | (42.6) |
Accretion | 31.3 |
Dispositions | (37.3) |
Reclamation expense | 11.4 |
Provisions at end of period | 861.4 | 908.3
Current portion | 62.3 |
Non-current portion | 799.1 |
Expense due to change in fair value | 11.4 | 27.2
Letter of credit issued to various agencies | 411.5 | 402.0
Surety bonds | $ 254.7 | $ 216.7
Reclamation and remediation obligations | Minimum |  |
Provisions reconciliation |  |
Discount rate used in estimating site restoration cost obligation (in percent) | 1.80% | 0.90%
Inflation rate used in estimating the site restoration cost obligation (in percent) | 1.80% | 2.40%
Reclamation and remediation obligations | Maximum |  |
Provisions reconciliation |  |
Discount rate used in estimating site restoration cost obligation (in percent) | 11.60% | 13.90%
Inflation rate used in estimating the site restoration cost obligation (in percent) | 5.00% | 5.60%
Other |  |
Provisions reconciliation |  |
Provisions at beginning of period | $ 46.1 |
Additions | 6.2 |
Reductions | (16.4) |
Dispositions | (0.3) |
Provisions at end of period | 35.6 | $ 46.1
Current portion | 4.2 |
Non-current portion | $ 31.4 |

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- Definition The amount of non-current provisions other than provisions for employee benefits. [Refer: Non-current provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 78 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_78_d&doctype=Standard -URIDate 2017-03-09 + Details
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