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Goodwill and Intangible Assets - Changes To The Net Book Value Of Goodwill And Intangible Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Changes in intangible assets and goodwill [abstract] |  |  |
Intangible assets and goodwill, beginning balance | $ 449.6 | $ 482.0 |
Additions | 3.5 | 1.8 |
Adjustment through business combinations(i) |  | (3.7) |
Amortization | (25.6) | (29.6) | $ (15.4)
Write-down of assets |  | (0.8) |
Foreign exchange and other | 0.5 | (0.1) |
Intangible assets and goodwill, ending balance | 428.0 | 449.6 | 482.0
Goodwill |  |  |
Changes in intangible assets and goodwill [abstract] |  |  |
Adjustment through business combinations(i) |  | 0.0 |
Foreign exchange and other | 0.3 | (0.1) |
Other intangible assets |  |  |
Changes in intangible assets and goodwill [abstract] |  |  |
Intangible assets and goodwill, beginning balance | 242.3 | 269.8 |
Additions | 0.0 | 0.0 |
Adjustment through business combinations(i) |  | (3.0) |
Amortization | (21.8) | (24.6) |
Foreign exchange and other | 0.1 | 0.1 |
Intangible assets and goodwill, ending balance | 220.6 | 242.3 | 269.8
Computer software assets |  |  |
Changes in intangible assets and goodwill [abstract] |  |  |
Intangible assets and goodwill, beginning balance | 9.0 | 13.8 |
Additions | 3.5 | 1.8 |
Adjustment through business combinations(i) |  | (0.7) |
Amortization | (3.8) | (5.0) |
Write-down of assets |  | (0.8) |
Foreign exchange and other | 0.1 | (0.1) |
Intangible assets and goodwill, ending balance | $ 8.8 | $ 9.0 | $ 13.8

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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 2020-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_118_e_i&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_118_e_i&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 118 -Subparagraph e -Clause vi -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_118_e_vi&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of impairment loss recognised in profit or loss for intangible assets other than goodwill. [Refer: Impairment loss recognised in profit or loss; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2020-01-01 -Paragraph 118 -Subparagraph e -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_118_e_iv&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in intangible assets and goodwill resulting from the net exchange differences arising when the financial statements are translated from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Intangible assets and goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2020-01-01 -Paragraph 118 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_118_e_vii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of intangible assets and goodwill held by the entity. [Refer: Goodwill; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
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