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Consolidated Statements of Cash Flows - CAD CAD in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Operating activities |  |
Profit for the year | CAD 2,538 | CAD 1,041
Depreciation and amortization | 1,467 | 1,385
Provision for income taxes | 1,438 | 587
Asset impairments and (impairment reversal) | (163) | 294
Gain on sale of investments and assets | (51) | (96)
Foreign exchange gains | (5) | (46)
Loss (gain) on debt repurchase | 216 | (49)
Gain on debt prepayment options | (51) | (113)
Finance expense | 229 | 354
Income taxes paid | (879) | (272)
Other | 233 | 331
Net change in non-cash working capital items | 94 | (360)
Net cash generated by operating activities | 5,066 | 3,056
Investing activities |  |
Property, plant and equipment | (1,621) | (1,416)
Capitalized production stripping costs | (678) | (477)
Expenditures on financial investments and other assets | (309) | (114)
Proceeds from the sale of investments and other assets | 109 | 170
Net cash used in investing activities | (2,499) | (1,837)
Financing activities |  |
Issuance of debt |  | 1,567
Repurchase and repayment of debt | (1,929) | (2,560)
Debt interest and finance charges paid | (495) | (571)
Issuance of Class B subordinate voting shares | 26 | 8
Purchase and cancellation of Class B subordinate voting shares | (175) |
Dividends paid | (344) | (58)
Distributions to non-controlling interests | (56) | (21)
Net cash used in financing activities | (2,973) | (1,635)
Effect of exchange rate changes on cash and cash equivalents | (49) | (64)
Decrease in cash and cash equivalents | (455) | (480)
Cash and cash equivalents at beginning of year | 1,407 | 1,887
Cash and cash equivalents at end of year | CAD 952 | CAD 1,407

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