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Financial Instruments Effects of Derivative Instruments on Condensed Consolidated Statements of Operations (Details) (Foreign currency contracts, USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 31, 2014 | Oct. 31, 2013 | Oct. 31, 2014 | Oct. 31, 2013
Designated as hedging instrument |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of gain (loss) recognized in accumulated other comprehensive income on derivatives (effective portion) | $ 22.3 | $ (4.6) | $ 22.5 | $ 8.0
Amount and location of gain (loss) reclassified from accumulated other comprehensive income into income (effective portion) | 1.3 | 2.0 | 2.9 | 9.7
Designated as hedging instrument | Net revenue |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount and location of gain (loss) reclassified from accumulated other comprehensive income into income (effective portion) | 2.1 | 2.3 | 4.6 | 11.0
Designated as hedging instrument | Operating expenses |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount and location of gain (loss) reclassified from accumulated other comprehensive income into income (effective portion) | (0.8) | (0.3) | (1.7) | (1.3)
Designated as hedging instrument | Interest and other (expense) income, net |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount and location of gain (loss) recognized in income on derivatives (ineffective portion and amount excluded from effectiveness testing) | 0.1 | (0.1) | 0.3 | (0.1)
Not designated as hedging instrument | Interest and other (expense) income, net |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount and location of (loss) gain recognized in income on derivatives | $ (4.5) | $ 2.9 | $ (14.8) | $ 4.9

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624177-113959 + Details
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- Definition The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: 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=35706170&loc=SL5624171-113959 + Details
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