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Business acquisitions and dispositions - Acquisiton of AlarmForce Industries Inc. Narrative (Details) customer in Thousands, $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jan. 05, 2018 CAD ($) shares customer | Jun. 30, 2018 CAD ($) | Jun. 30, 2017 CAD ($) | Jun. 30, 2018 CAD ($) | Jun. 30, 2017 CAD ($)
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Disposition of intangibles and other assets |  | $ 0 | $ 323 | $ 68 | $ 323
AlarmForce |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Consideration transferred, acquisition-date fair value | $ 182 |  |  |  |
Cash consideration | 181 |  |  |  |
Equity interests of acquirer | $ 1 |  |  |  |
Number of shares transferred (in shares) | shares | 22,531 |  |  |  |
Revenue of acquiree since acquisition date |  |  |  | 26 |
Profit (loss) of acquiree since acquisition date |  |  |  | $ 2 |
Customer accounts | AlarmForce |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Number of customer accounts | customer | 39 |  |  |  |
Disposition of intangibles and other assets | $ 68 |  |  |  |

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