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Derivatives and Hedging Activities - Fair Value of Derivative Instruments (Detail) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
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Derivatives, Fair Value [Line Items] |  |
Fair Value of Asset Derivatives | $ 33.4 | $ 5.4
Fair Value of (Liability) Derivatives | (5.7) | (30.4)
Foreign currency forward contracts [Member] | Designated as hedging instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value of Asset Derivatives | 1.3 | 0.5
Fair Value of (Liability) Derivatives | (1.5) | (0.8)
Foreign currency forward contracts [Member] | Not designated as hedging instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value of Asset Derivatives | 32.1 | 4.9
Fair Value of (Liability) Derivatives | $ (4.2) | $ (29.6)

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- Definition Fair value of the gross assets less the gross liabilities of a derivative asset or group of derivative assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13495-108611 + Details
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