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Supplemental Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2019
Disclosure of Cash Flow Statement [Abstract] |
Schedules of Cash Flow, Supplemental Disclosures | Changes in working capital and income taxes received or paid:
| December 31, | December 31,
| 2019 | 2018
Amounts receivable | ($0.4 | ) | ($10.7 | )
Inventory | (11.4 | ) | 13.9 |
Advances and prepaid expenses | (2.8 | ) | (7.2 | )
Accounts payable and accrued liabilities | (17.8 | ) | 9.4 |
Income taxes paid | (4.1 | ) | (4.2 | )
| ($36.5 | ) | $1.2 |
Interest received | $3.4 | $2.8
Other items:
| December 31, | December 31,
| 2019 | 2018
Unrealized loss on non-hedging derivatives |  | $0.6 |  |  | $0.4 |
Payment for reclamation activities | (2.0 | ) | (0.9 | )
Interest received | 3.4 |  | 2.8 |
Credit facility standby fees | (1.8 | ) | (1.8 | )
Reduction of obligation to renounce flow-through exploration expenditures | (0.6 | ) | (0.6 | )
Loss on disposal of assets | 0.7 |  | 6.1 |
Gain on sale of non-core royalties | (8.0 | ) | — |
Other non-cash items | (0.7 | ) | 0.5 |
| ($8.4 | ) | $6.5 |
Schedule of Other Significant Noncash Transactions | Other items:
| December 31, | December 31,
| 2019 | 2018
Unrealized loss on non-hedging derivatives |  | $0.6 |  |  | $0.4 |
Payment for reclamation activities | (2.0 | ) | (0.9 | )
Interest received | 3.4 |  | 2.8 |
Credit facility standby fees | (1.8 | ) | (1.8 | )
Reduction of obligation to renounce flow-through exploration expenditures | (0.6 | ) | (0.6 | )
Loss on disposal of assets | 0.7 |  | 6.1 |
Gain on sale of non-core royalties | (8.0 | ) | — |
Other non-cash items | (0.7 | ) | 0.5 |
| ($8.4 | ) | $6.5 |

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