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Long-term debt (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Non-current portion of non-current borrowings, by type [abstract] |  |
Total long-term debt | $ 491.0 | $ 489.2
Senior unsecured notes - due May 15, 2025 |  |
Non-current portion of non-current borrowings, by type [abstract] |  |
Total long-term debt | 97.1 | 96.3
Senior unsecured notes - due July 15, 2027 |  |
Non-current portion of non-current borrowings, by type [abstract] |  |
Total long-term debt | 393.9 | 392.9
Credit Facility |  |
Non-current portion of non-current borrowings, by type [abstract] |  |
Total long-term debt | $ 0.0 | $ 0.0

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- Definition The non-current portion of non-current borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_LongtermBorrowings
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | ifrs-full_NoncurrentPortionOfNoncurrentBorrowingsByTypeAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_BorrowingsByNameAxis=ngd_TwoThousandTwentyFiveUnsecuredNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_BorrowingsByNameAxis=ngd_TwoThousandTwentySevenUnsecuredNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_BorrowingsByNameAxis=ngd_RevolvingCreditFacility1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |