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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
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Changes in intangible assets and goodwill [abstract] |  |  |  |  |
Intangible assets and goodwill, beginning balance | $ 44.8 | $ 48.7 |  |  |
Additions | 3.3 | 4.9 |  |  |
Acquisitions through business combinations (note 3) | 449.2 |  |  |  |
Amortization | (15.4) | (8.9) | [1] | $ (9.4) | [1]
Foreign exchange and other | 0.1 | 0.1 |  |  |
Intangible assets and goodwill, ending balance | 482.0 | 44.8 |  | 48.7 |
Goodwill |  |  |  |  |
Changes in intangible assets and goodwill [abstract] |  |  |  |  |
Intangible assets and goodwill, beginning balance | 23.2 | 23.2 |  |  |
Acquisitions through business combinations (note 3) | 175.2 |  |  |  |
Foreign exchange and other | 0.0 | 0.0 |  |  |
Intangible assets and goodwill, ending balance | 198.4 | 23.2 |  | 23.2 |
Other intangible assets |  |  |  |  |
Changes in intangible assets and goodwill [abstract] |  |  |  |  |
Intangible assets and goodwill, beginning balance | 10.4 | 15.9 |  |  |
Additions | 0.0 | 0.0 |  |  |
Acquisitions through business combinations (note 3) | 271.0 |  |  |  |
Amortization | (11.6) | (5.5) |  |  |
Foreign exchange and other | 0.0 | 0.0 |  |  |
Intangible assets and goodwill, ending balance | 269.8 | 10.4 |  | 15.9 |
Computer software assets |  |  |  |  |
Changes in intangible assets and goodwill [abstract] |  |  |  |  |
Intangible assets and goodwill, beginning balance | 11.2 | 9.6 |  |  |
Additions | 3.3 | 4.9 |  |  |
Acquisitions through business combinations (note 3) | 3.0 |  |  |  |
Amortization | (3.8) | (3.4) |  |  |
Foreign exchange and other | 0.1 | 0.1 |  |  |
Intangible assets and goodwill, ending balance | $ 13.8 | $ 11.2 |  | $ 9.6 |
[1] | Certain prior period figures have been restated to reflect the adoption of IFRS 15 (see note 2)

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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 2017-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118_e_i&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118_e_i&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 118 -Subparagraph e -Clause vi -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118_e_vi&doctype=Standard -URIDate 2017-03-09 + Details
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