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Net Interest Expense and Other Net Finance Expense | 12 Months Ended
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Dec. 31, 2017
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Net Interest Expense and Other Net Finance Expense | 30. Net Interest Expense and Other Net Finance Expense
Net interest expense |  | For the year ended December 31 |
|  | 2017 $ |  |  | 2016 $ |
Interest on notes payable |  |  | 2.9 |  |  |  | 4.4 |
Interest on revolving credit facilities |  |  | 24.4 |  |  |  | 19.8 |
Interest on senior secured notes |  |  | - |  |  |  | 5.8 |
Interest on finance leases |  |  | 0.1 |  |  |  | 0.3 |
Other |  |  | 1.6 |  |  |  | 1.1 |
Total interest expense |  |  | 29.0 |  |  |  | 31.4 |
Interest income on available-for-sale investment debt securities |  |  | (2.4 | ) |  |  | (2.1 | )
Other |  |  | (0.8 | ) |  |  | (0.7 | )
Total interest income |  |  | (3.2 | ) |  |  | (2.8 | )
Net interest expense |  |  | 25.8 |  |  |  | 28.6 |
Other net finance expense |  | For the year ended |
|  | December 31 |
|  | 2017 $ |  |  | 2016 $ |
Amortization on available-for-sale investment debt securities |  |  | 0.6 |  |  |  | 0.4 |
Bank charges |  |  | 8.6 |  |  |  | 7.4 |
Total other finance expense |  |  | 9.2 |  |  |  | 7.8 |
Realized gain on sale of available-for-sale investment debt securities |  |  | (1.4 | ) |  |  | (0.1 | )
Derecognition of notes payable |  |  | (0.7 | ) |  |  | (1.3 | )
Other net finance expense |  |  | 7.1 |  |  |  | 6.4 |

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