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Recent Accounting Pronouncements and Changes to Accounting Policies - Summary of Impacts of Adopting IFRS 15 in Consolidated Statement of Financial Position (Detail) - CAD ($) $ in Millions | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Current assets |  |  |
Unbilled receivables | $ 384.6 |  |
Contract assets | 59.7 | $ 69.2 |
Other assets | 23.2 |  | $ 14.0
Non-current assets |  |  |
Deferred tax assets | 21.2 |  | 23.2
Other assets | 175.5 |  | 195.5
Current liabilities |  |  |
Deferred revenue | 174.4 |  |
Shareholders' equity |  |  |
Retained earnings | 851.2 |  | 947.1
Accumulated other comprehensive income | 163.1 |  | $ 49.5
Previously stated [member] |  |  |
Current assets |  |  |
Unbilled receivables | 444.4 |  |
Other assets | 20.3 |  |
Non-current assets |  |  |
Deferred tax assets | 21.8 |  |
Other assets | 167.3 |  |
Current liabilities |  |  |
Deferred revenue | 165.7 |  |
Shareholders' equity |  |  |
Retained earnings | 848.9 |  |
Accumulated other comprehensive income | 163.7 |  |
Increase (decrease) due to changes in accounting policy required by IFRSs [member] |  |  |
Current assets |  |  |
Unbilled receivables | (59.8) |  |
Contract assets | 59.7 |  |
Other assets | 2.9 |  |
Non-current assets |  |  |
Deferred tax assets | (0.6) |  |
Other assets | 8.2 |  |
Current liabilities |  |  |
Deferred revenue | 8.7 |  |
Shareholders' equity |  |  |
Retained earnings | 2.3 |  |
Accumulated other comprehensive income | $ (0.6) |  |

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