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Intangible Assets - Schedule of Intangible Assets (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | $ 265.7 |
Ending balance | 427.0 | $ 265.7
Cost |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | 540.5 | 610.7
Additions | 84.4 | 13.7
Additions arising on acquisitions | 183.8 | 37.6
Removal of fully amortized assets | (68.8) | (112.6)
Impact of foreign exchange | 33.6 | (8.9)
Ending balance | 773.5 | 540.5
Accumulated depreciation |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | (274.8) | (290.3)
Amortization | 123.8 | 102.0
Removal of fully amortized assets | 68.8 | 112.6
Impact of foreign exchange | 16.7 | (4.9)
Ending balance | (346.5) | (274.8)
Client Relationships |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | 231.4 |
Ending balance | 326.2 | 231.4
Client Relationships | Cost |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | 464.1 | 471.9
Additions | 0.0 | 0.0
Additions arising on acquisitions | 137.7 | 25.2
Removal of fully amortized assets | (30.9) | (25.4)
Impact of foreign exchange | 31.3 | (7.6)
Ending balance | 602.2 | 464.1
Client Relationships | Accumulated depreciation |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | (232.7) | (215.6)
Amortization | 58.5 | 46.3
Removal of fully amortized assets | 30.9 | 25.4
Impact of foreign exchange | 15.7 | (3.8)
Ending balance | (276.0) | (232.7)
Contract Backlog |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | 8.3 |
Ending balance | 23.9 | 8.3
Contract Backlog | Cost |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | 12.4 | 48.6
Additions | 0.0 | 0.0
Additions arising on acquisitions | 45.8 | 12.4
Removal of fully amortized assets | (13.4) | (47.8)
Impact of foreign exchange | 2.0 | (0.8)
Ending balance | 46.8 | 12.4
Contract Backlog | Accumulated depreciation |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | (4.1) | (31.4)
Amortization | 31.1 | 21.3
Removal of fully amortized assets | 13.4 | 47.8
Impact of foreign exchange | 1.1 | (0.8)
Ending balance | (22.9) | (4.1)
Software and other |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | 26.0 |
Ending balance | 76.9 | 26.0
Software and other | Cost |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | 64.0 | 90.2
Additions | 84.4 | 13.7
Additions arising on acquisitions | 0.3 | 0.0
Removal of fully amortized assets | (24.5) | (39.4)
Impact of foreign exchange | 0.3 | (0.5)
Ending balance | 124.5 | 64.0
Software and other | Accumulated depreciation |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |
Beginning balance | (38.0) | (43.3)
Amortization | 34.2 | 34.4
Removal of fully amortized assets | 24.5 | 39.4
Impact of foreign exchange | (0.1) | (0.3)
Ending balance | $ (47.6) | $ (38.0)

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- Definition The increase in intangible assets other than goodwill resulting from acquisitions through business combinations. [Refer: Total for all business combinations [member]; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2024-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2024-en-r&anchor=para_118_e_i&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of additions to intangible assets other than goodwill, other than those acquired through business combinations. [Refer: Total for all business combinations [member]; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2024-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2024-en-r&anchor=para_118_e_i&doctype=Standard -URIDate 2024-03-27 + Details
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