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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Changes in intangible assets and goodwill [abstract] |  |  |
Intangible assets and goodwill, beginning balance | $ 48.7 | $ 49.9 |
Additions | 4.9 | 4.5 |
Acquisitions through business combinations (note 3) |  | 3.8 |
Amortization | (8.9) | (9.4) | $ (9.2)
Foreign exchange and other | 0.1 | (0.1) |
Intangible assets and goodwill, ending balance | 44.8 | 48.7 | 49.9
Goodwill |  |  |
Changes in intangible assets and goodwill [abstract] |  |  |
Intangible assets and goodwill, beginning balance | 23.2 | 19.5 |
Acquisitions through business combinations (note 3) |  | 3.7 |
Foreign exchange and other | 0.0 | 0.0 |
Intangible assets and goodwill, ending balance | 23.2 | 23.2 | 19.5
Other intangible assets |  |  |
Changes in intangible assets and goodwill [abstract] |  |  |
Intangible assets and goodwill, beginning balance | 15.9 | 21.9 |
Additions | 0.0 | 0.0 |
Acquisitions through business combinations (note 3) |  | 0.0 |
Amortization | (5.5) | (6.0) |
Foreign exchange and other | 0.0 | 0.0 |
Intangible assets and goodwill, ending balance | 10.4 | 15.9 | 21.9
Computer software assets |  |  |
Changes in intangible assets and goodwill [abstract] |  |  |
Intangible assets and goodwill, beginning balance | 9.6 | 8.5 |
Additions | 4.9 | 4.5 |
Acquisitions through business combinations (note 3) |  | 0.1 |
Amortization | (3.4) | (3.4) |
Foreign exchange and other | 0.1 | (0.1) |
Intangible assets and goodwill, ending balance | $ 11.2 | $ 9.6 | $ 8.5

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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 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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- 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 2017-01-01 -Paragraph 118 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118_e_vii&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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