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Goodwill - Summarizes Goodwill Movement (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Goodwill And Intangible Assets Disclosure [Abstract] |  |  |  |
At January 1, Gross cost |  |  | $ 384.2 | $ 375.5
At January 1, Accumulated impairment losses |  |  | (235.2) | (234.0)
At January 1, Net book amount |  |  | 149.0 | 141.5
Exchange effect |  |  | (0.1) | (0.1)
Adjustments to purchase price allocation |  |  | 0.4 | 0
Impairment losses | (0.3) | (0.3) | (0.6) | (0.6)
At June 30, Gross cost | 384.5 | 375.4 | 384.5 | 375.4
At June 30, Accumulated impairment losses | (235.8) | (234.6) | (235.8) | (234.6)
At June 30, Net book amount | $ 148.7 | $ 140.8 | $ 148.7 | $ 140.8

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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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- Definition Amount before 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 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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