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Business acquisitions - Narrative (Details) $ in Millions, $ in Millions |  |  | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 30, 2025 CAD ($) | Jul. 30, 2025 USD ($) | Jun. 25, 2025 CAD ($) | Jun. 25, 2025 USD ($) | Jun. 30, 2024 CAD ($) | Aug. 01, 2025 CAD ($) | Aug. 01, 2025 USD ($) | Apr. 30, 2025 advertising_display | Jul. 02, 2024 CAD ($) | Jun. 07, 2024 CAD ($)
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Number of advertising displays to be disposed | advertising_display |  |  |  |  |  |  |  | 669 |  |
Ziply Fiber |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Cash advances to related party, maximum amount |  |  | $ 206 | $ 150 |  |  |  |  |  |
Loan Agreement | Ziply Fiber |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Cash advances and loans from related parties | $ 104 | $ 75 |  |  |  |  |  |  |  |
OUTFRONT Media |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Consideration recognized as of acquisition date |  |  |  |  |  |  |  |  |  | $ 429
Cash transferred, net of cash acquired |  |  |  |  |  |  |  |  |  | 418
Total cost to be allocated |  |  |  |  |  |  |  |  |  | $ 429
Stratejm |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Consideration recognized as of acquisition date |  |  |  |  |  |  |  |  | $ 78 |
Cash transferred, net of cash acquired |  |  |  |  |  |  |  |  | 73 |
Revenue of combined entity as if combination occurred at beginning of period |  |  |  |  | $ 12,027 |  |  |  |  |
Contingent consideration, maximum amount payable |  |  |  |  |  |  |  |  | 20 |
Total cost to be allocated |  |  |  |  |  |  |  |  | $ 89 |
OUTEDGE |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Revenue of acquiree since acquisition date |  |  |  |  | 8 |  |  |  |  |
Revenue of combined entity as if combination occurred at beginning of period |  |  |  |  | $ 12,063 |  |  |  |  |
Ziply Fiber | Major business combination |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Consideration recognized as of acquisition date |  |  |  |  |  | $ 5,040 | $ 3,650 |  |  |
Borrowings recognised as of acquisition date |  |  |  |  |  | $ 2,650 | $ 1,920 |  |  |

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