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Goodwill - Summary of Goodwill (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Goodwill And Intangible Assets Disclosure [Abstract] |  |  |  |
At January 1, Gross cost |  |  | $ 424.4 | $ 384.2
At January 1, Accumulated impairment losses |  |  | (236.5) | (235.2)
At January 1, Net book amount |  |  | 187.9 | 149.0
Exchange effect |  |  | (0.1) | (0.1)
Adjustments to purchase price allocation |  |  | 0.3 | 0.4
Impairment losses | 0 | (0.3) | 0 | (0.6)
At June 30, Gross cost | 424.6 | 384.5 | 424.6 | 384.5
At June 30, Accumulated impairment losses | (236.5) | (235.8) | (236.5) | (235.8)
At June 30, Net book amount | $ 188.1 | $ 148.7 | $ 188.1 | $ 148.7

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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