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Business acquisitions and dispositions - Acquisition of Cieslok Media Ltd. Narrative (Details) shares in Millions, $ in Millions | Jan. 05, 2018 CAD ($) shares | Jan. 03, 2017 CAD ($)
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Cieslok Media |  |
Disclosure of detailed information about business combination [line items] |  |
Consideration transferred, acquisition-date fair value |  | $ 161
Cash transferred |  | $ 161
Major business combination | AlarmForce |  |
Disclosure of detailed information about business combination [line items] |  |
Consideration transferred, acquisition-date fair value | $ 182 |
Cash transferred | 181 |
Equity interests of acquirer | $ 1 |
Number of instruments or interests issued or issuable | shares | 0.0 |

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