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Debt (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 22, 2019 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2020 | Jul. 31, 2020 | Mar. 31, 2020 | Feb. 01, 2019 | Mar. 31, 2017
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Amount drawn down |  |  | $ 80,000,000 | $ 335,000,000 |  |  |  |  |
Repayment of credit facility |  |  | 355,000,000 | 185,000,000 |  |  |  |  |
Credit Facility [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Total long-term debt |  |  | $ 0 | $ 275,000,000 |  |  |  |  |
Credit facility term |  |  |  | 4 years |  |  |  |  |
Line of credit, maximum borrowing capacity |  |  |  | $ 300,000,000.0 |  |  |  |  |
Debt covenant, tangible net worth requirement |  |  |  |  |  |  |  |  | $ 1,036,400,000
Debt covenant, tangible net worth, net income added (percent) |  | 50.00% |  |  |  |  |  |  |
Debt covenant, tangible net worth requirement, percent |  |  |  |  |  |  | 70.00% |  |
Debt covenant, leverage ratio |  |  | 3.5 |  |  |  |  |  |
Debt covenant, interest coverage ratio |  |  | 3.0 |  |  |  |  |  |
Repayment of credit facility |  |  | $ 60,000,000 |  |  |  |  |  |
Standby charges on undrawn amounts |  |  | 2,200,000 | 900,000 |  |  |  |  |
Interest expense on borrowings |  |  | 5,000,000.0 | $ 11,600,000 |  |  |  |  |
Loans [Member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Total long-term debt |  |  | $ 0.0 |  |  |  |  |  |
Amount borrowed |  |  |  |  | $ 2,800,000 | $ 2,800,000 |  |  |
Weighted average [member] | Credit Facility [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Interest rate on borrowings (percent) |  |  | 2.60% | 4.30% |  |  |  |  |
Weighted average [member] | Loans [Member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Interest rate on borrowings (percent) |  |  | 1.30% |  |  |  |  |  |
Tahoe Resources, Inc [member] | Credit Facility [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Line of credit, maximum borrowing capacity | $ 500,000,000.0 |  |  |  |  |  |  | $ 400,000,000.0 |
Additional upfront costs | $ 2,000,000.0 |  |  |  |  |  |  |  |
Repayment of credit facility |  |  | $ 125,000,000 |  |  |  |  |  |
Tahoe Resources, Inc [member] | Bottom of range [member] | Credit Facility [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Line of credit facility, unused capacity, commitment fee (percent) |  |  | 0.4219% |  |  |  |  |  |
Tahoe Resources, Inc [member] | Top of range [member] | Credit Facility [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Line of credit facility, unused capacity, commitment fee (percent) |  |  | 0.6188% |  |  |  |  |  |
Tahoe Resources, Inc [member] | LIBOR [member] | Bottom of range [member] | Credit Facility [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis |  |  | 1.875% |  |  |  |  |  |
Tahoe Resources, Inc [member] | LIBOR [member] | Top of range [member] | Credit Facility [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis |  |  | 2.75% |  |  |  |  |  |
Tahoe Resources, Inc [member] | Bank of Nova Scotia's Base Rate [member] | Bottom of range [member] | Credit Facility [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis |  |  | 0.875% |  |  |  |  |  |
Tahoe Resources, Inc [member] | Bank of Nova Scotia's Base Rate [member] | Top of range [member] | Credit Facility [member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis |  |  | 1.75% |  |  |  |  |  |

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