Derivatives and Hedging Activities - Fair Value of Derivative Instruments (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
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)

Fair value of the gross liabilities less the gross assets of a derivative liability or group of derivative liabilities.

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

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant