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Income taxes - DTA and DTL (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Non-capital loss |  |  |
Net deferred tax assets | $ 17.3 | $ 14.5 |
Net deferred tax liabilities | 67.3 | 60.3 |
Deferred income tax liabilities, net | 50.0 | 45.8 | $ 16.2
Within 12 months |  |  |
Non-capital loss |  |  |
Net deferred tax assets | 0.1 | 0.1 |
Net deferred tax liabilities | 1.0 | 0.9 |
After more than 12 months |  |  |
Non-capital loss |  |  |
Net deferred tax assets | 17.2 | 14.4 |
Net deferred tax liabilities | 66.3 | 59.4 |
Share issue and debt issue costs deferred income tax liabilities |  |  |
Non-capital loss |  |  |
Net deferred tax liabilities | (3.7) | (7.1) |
Royalty stream and working interests deferred income tax assets |  |  |
Non-capital loss |  |  |
Net deferred tax assets | 16.2 | 5.6 |
Royalty stream and working interests deferred income tax liabilities |  |  |
Non-capital loss |  |  |
Net deferred tax liabilities | 74.8 | 71.1 |
Non-capital loss carry-forwards deferred income tax assets |  |  |
Non-capital loss |  |  |
Net deferred tax assets | 1.9 | 9.5 |
Non-capital loss carry-forwards deferred income tax liabilities |  |  |
Non-capital loss |  |  |
Net deferred tax liabilities | (2.6) | (5.6) |
Investments deferred income tax liabilities |  |  |
Non-capital loss |  |  |
Net deferred tax liabilities | 2.5 | 5.8 |
Other deferred income tax assets |  |  |
Non-capital loss |  |  |
Net deferred tax assets | (0.8) | (0.6) |
Other deferred income tax liabilities |  |  |
Non-capital loss |  |  |
Net deferred tax liabilities | $ (3.7) | $ (3.9) |

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