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Schedule of Notional Amount of Derivatives (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Intercompany Foreign Currency Balance [Line Items] |  |
Notional amounts, Buy Position | $ (16.8) | $ (16.0)
Notional amounts, Sell Position | 47.3 | 69.3
Notional amounts, Net Total | 30.5 | 53.3
Japanese Yen |  |
Intercompany Foreign Currency Balance [Line Items] |  |
Notional amounts, Sell Position | 36.3 | 50.8
Notional amounts, Net Total | 36.3 | 50.8
Taiwan Dollar |  |
Intercompany Foreign Currency Balance [Line Items] |  |
Notional amounts, Buy Position |  | (0.8)
Notional amounts, Sell Position | 4.2 | 6.3
Notional amounts, Net Total | 4.2 | 5.5
British Pound Sterling |  |
Intercompany Foreign Currency Balance [Line Items] |  |
Notional amounts, Sell Position | 5.5 | 10.1
Notional amounts, Net Total | 5.5 | 10.1
Euro |  |
Intercompany Foreign Currency Balance [Line Items] |  |
Notional amounts, Buy Position | (16.8) | (15.2)
Notional amounts, Sell Position | 1.3 | 2.1
Notional amounts, Net Total | $ (15.5) | $ (13.1)

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- Definition Aggregate notional amount of foreign currency derivatives to purchase a foreign currency. Notional amount refers to the number of currency units specified in the foreign currency derivative contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959 + Details
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- Definition Aggregate notional amount of foreign currency exchange rate derivatives. Notional amount refers to the number of currency units specified in the foreign currency derivative contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
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- Definition Aggregate notional amount of foreign currency derivatives to sell a foreign currency. Notional amount refers to the number of currency units specified in the foreign currency derivative contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959 + Details
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