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Income taxes - DTA and DTL (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Non-capital loss |  |  |
Deferred income tax liabilities, net | $ 46.4 | $ 75.6 | $ 50.0
Share issue and debt issue costs deferred income tax liabilities |  |  |
Non-capital loss |  |  |
Net deferred tax liabilities | 0.3 | (1.7) |
Royalty stream and working interests deferred income tax assets |  |  |
Non-capital loss |  |  |
Net deferred tax assets | 44.1 | 6.5 |
Royalty stream and working interests deferred income tax liabilities |  |  |
Non-capital loss |  |  |
Net deferred tax liabilities | 89.6 | 89.0 |
Non-capital loss carry-forwards deferred income tax assets |  |  |
Non-capital loss |  |  |
Net deferred tax assets | 0.6 | 0.3 |
Non-capital loss carry-forwards deferred income tax liabilities |  |  |
Non-capital loss |  |  |
Net deferred tax liabilities | (3.9) | (4.3) |
Investments deferred income tax liabilities |  |  |
Non-capital loss |  |  |
Net deferred tax liabilities | 11.6 | 4.3 |
Other deferred income tax assets |  |  |
Non-capital loss |  |  |
Net deferred tax assets | 0.4 |  |
Other deferred income tax liabilities |  |  |
Non-capital loss |  |  |
Net deferred tax liabilities | (6.1) | (4.9) |
Deferred income tax assets |  |  |
Non-capital loss |  |  |
Net deferred tax assets | 45.1 | 6.8 |
Deferred income tax liabilities |  |  |
Non-capital loss |  |  |
Net deferred tax liabilities | $ 91.5 | $ 82.4 |

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