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Income taxes - DTA and DTL (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Non-capital loss |  |  |
Net deferred tax assets | $ 6.8 | $ 17.3 |
Net deferred tax liabilities | 82.4 | 67.3 |
Deferred income tax liabilities, net | 75.6 | 50.0 | $ 45.8
Share issue and debt issue costs deferred income tax liabilities |  |  |
Non-capital loss |  |  |
Net deferred tax liabilities | (1.7) | (3.7) |
Royalty stream and working interests deferred income tax assets |  |  |
Non-capital loss |  |  |
Net deferred tax assets | 6.5 | 16.2 |
Royalty stream and working interests deferred income tax liabilities |  |  |
Non-capital loss |  |  |
Net deferred tax liabilities | 89.0 | 74.8 |
Non-capital loss carry-forwards deferred income tax assets |  |  |
Non-capital loss |  |  |
Net deferred tax assets | 0.3 | 1.9 |
Non-capital loss carry-forwards deferred income tax liabilities |  |  |
Non-capital loss |  |  |
Net deferred tax liabilities | (4.3) | (2.6) |
Investments deferred income tax liabilities |  |  |
Non-capital loss |  |  |
Net deferred tax liabilities | 4.3 | 2.5 |
Other deferred income tax assets |  |  |
Non-capital loss |  |  |
Net deferred tax assets |  | (0.8) |
Other deferred income tax liabilities |  |  |
Non-capital loss |  |  |
Net deferred tax liabilities | $ (4.9) | $ (3.7) |

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