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Goodwill and Intangible Assets - Changes to the Net Book Value of Goodwill and Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Changes in intangible assets and goodwill [abstract] |  |  |  |
Goodwill at beginning of period |  | $ 321.8 |  |
Intangible assets, beginning balance | $ 706.2 | 668.3 | $ 706.2 |
Additions |  | 11.4 | 1.9 |
Adjustment to acquisitions through business combination |  |  | 0.5 |
Amortization |  | (39.6) | (40.1) | $ (25.5)
Foreign exchange and other |  | (0.1) | (0.2) |
Goodwill at end of period |  | 321.7 | 321.8 |
Intangible assets, ending balance |  | 640.0 | 668.3 | 706.2
PCI |  |  |  |
Changes in intangible assets and goodwill [abstract] |  |  |  |
Adjustment to acquisitions through business combination - goodwill | (2.2) |  |  |
PCI | Customer Intangible Assets |  |  |  |
Changes in intangible assets and goodwill [abstract] |  |  |  |
Changes to preliminary purchase price allocation | 2.7 |  |  |
Goodwill |  |  |  |
Changes in intangible assets and goodwill [abstract] |  |  |  |
Goodwill at beginning of period | 324.2 | 321.8 | 324.2 |
Adjustment to acquisitions through business combination - goodwill |  |  | (2.2) |
Foreign exchange and other |  | (0.1) | (0.2) |
Goodwill at end of period |  | 321.7 | 321.8 | 324.2
Other intangible assets |  |  |  |
Changes in intangible assets and goodwill [abstract] |  |  |  |
Intangible assets, beginning balance | 371.5 | 337.2 | 371.5 |
Additions |  | 0.0 | 0.0 |
Adjustment to acquisitions through business combination |  |  | 2.7 |
Amortization |  | (36.8) | (37.0) |
Foreign exchange and other |  | 0.0 | 0.0 |
Intangible assets, ending balance |  | 300.4 | 337.2 | 371.5
Computer software assets |  |  |  |
Changes in intangible assets and goodwill [abstract] |  |  |  |
Intangible assets, beginning balance | $ 10.5 | 9.3 | 10.5 |
Additions |  | 11.4 | 1.9 |
Adjustment to acquisitions through business combination |  |  | 0.0 |
Amortization |  | (2.8) | (3.1) |
Foreign exchange and other |  | 0.0 | 0.0 |
Intangible assets, ending balance |  | $ 17.9 | $ 9.3 | $ 10.5

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- Definition The increase in intangible assets and goodwill resulting from acquisitions through business combinations. [Refer: Business combinations [member]; Intangible assets and goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2023-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2023-en-r&anchor=para_118_e_i&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of additions to intangible assets other than goodwill, other than those acquired through business combinations. [Refer: Business combinations [member]; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2023-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2023-en-r&anchor=para_118_e_i&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of amortisation of intangible assets other than goodwill. [Refer: Depreciation and amortisation expense; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2023-01-01 -Paragraph 118 -Subparagraph e -Clause vi -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2023-en-r&anchor=para_118_e_vi&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The increase (decrease) in goodwill. [Refer: Goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2023-01-01 -Paragraph B67 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2023-en-r&anchor=para_B67_d&doctype=Appendix&subtype=B -URIDate 2023-03-23 + Details
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- Definition The amount of assets representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognised. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2023-01-01 -Paragraph 134 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2023-en-r&anchor=para_134_a&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2023-01-01 -Paragraph 135 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2023-en-r&anchor=para_135_a&doctype=Standard -URIDate 2023-03-23 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2023-01-01 -Paragraph B67 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2023-en-r&anchor=para_B67_d&doctype=Appendix&subtype=B -URIDate 2023-03-23 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 54 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_54_c&doctype=Standard -URIDate 2023-03-23 + Details
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