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Consolidated Statements of Changes in Equity - CAD CAD in Millions | Total | Issued capital [member] Class A Common Shares [member] | Issued capital [member] Class B subordinate voting shares [member] | Retained earnings [member] | Additional paid-in capital [member] | Accumulated other comprehensive income attributable to shareholders of the company [member] | Non-controlling interests [member]
--- | --- | --- | --- | --- | --- | --- | ---
Beginning of year at Dec. 31, 2015 |  | CAD 7 | CAD 6,627 | CAD 9,174 | CAD 173 | CAD 426 | CAD 230
Profit for the year attributable to non-controlling interests | CAD 1 |  |  |  |  |  | 1
Profit for the year attributable to shareholders of the company | 1,040 |  |  | 1,040 |  |  |
Share option compensation expense (Note 23(c)) |  |  |  |  | 22 |  |
Other comprehensive income (loss) | 15 |  |  |  |  | 15 |
Dividends declared (Note 23(g)) |  |  |  | (58) |  |  |
Transfer to Class B subordinate voting shares on exercise of options |  |  |  |  | (2) |  |
Less remeasurements of retirement benefit plans recorded in retained earnings |  |  |  |  |  | (19) |
Issued on exercise of options (Note 23(c)) |  |  | 10 |  |  |  |
Purchase of non-controlling interests |  |  |  | 8 |  |  | (46)
Remeasurements of retirement benefit plans |  |  |  | 19 |  |  |
Other |  |  |  |  |  |  | (5)
Dividends or distributions |  |  |  |  |  |  | (21)
End of year at Dec. 31, 2016 | 17,601 | 7 | 6,637 | 10,183 | 193 | 422 | 159
Profit for the year attributable to non-controlling interests | 29 |  |  |  |  |  | 29
Profit for the year attributable to shareholders of the company | 2,509 |  |  | 2,509 |  |  |
Share option compensation expense (Note 23(c)) |  |  |  |  | 17 |  |
Other comprehensive income (loss) | (29) |  |  |  |  | (29) |
Other comprehensive loss attributable to non-controlling interests | (8) |  |  |  |  |  | (8)
Dividends declared (Note 23(g)) |  |  |  | (344) |  |  |
Transfer to Class B subordinate voting shares on exercise of options |  |  |  |  | (8) |  |
Less remeasurements of retirement benefit plans recorded in retained earnings |  |  |  |  |  | (129) |
Share repurchases (Note 23(h)) |  |  | (69) | (106) |  |  |
Issued on exercise of options (Note 23(c)) |  |  | 34 |  |  |  |
Class A share conversion (Note 23(b)) |  | (1) | 1 |  |  |  |
Purchase of non-controlling interests |  |  |  | (63) |  |  |
Acquisition of AQM Copper Inc. |  |  |  |  |  |  | 18
Remeasurements of retirement benefit plans |  |  |  | 129 |  |  |
Dividends or distributions |  |  |  |  |  |  | (56)
End of year at Dec. 31, 2017 | CAD 19,525 | CAD 6 | CAD 6,603 | CAD 12,308 | CAD 202 | CAD 264 | CAD 142

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