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Financial Instruments - Net Investment Hedge Derivative Instruments on OCI (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
Euro-denominated Revolving Credit Facilities [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Amount of Gain (Loss) Recognized in OCI on Derivatives (Effective Portion) | $ (0.1) | $ 0.4 | $ 0.1 | $ 0.3
Canadian Dollar-denominated Revolving Credit Facilities [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Amount of Gain (Loss) Recognized in OCI on Derivatives (Effective Portion) | $ 0.9 | $ 1.7 | $ 1.3 | $ 0.4

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- Definition Current period adjustment in other comprehensive income reflecting gains or losses on foreign currency transactions that are designated as, and are effective as, hedges of a net investment in a foreign entity, net of tax effect. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32211-110900 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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