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Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Apr. 30, 2015 | Apr. 30, 2014
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balances, January 31, 2015 | $ (53.3)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |
Other comprehensive income (loss) before reclassifications | 2.4 us-gaap_OciBeforeReclassificationsBeforeTaxAttributableToParent |
Pre-tax (gains) losses reclassified from accumulated other comprehensive income | (7.3)us-gaap_ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent |
Tax effects | 2.2 us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 |
Net current period other comprehensive (loss) income | (2.7)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent | 6.2 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Balances, April 30, 2015 | (56.0)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |
Net Unrealized Gains (Losses) on Derivative Instruments |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balances, January 31, 2015 | 42.8 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |
Other comprehensive income (loss) before reclassifications | 3.8 us-gaap_OciBeforeReclassificationsBeforeTaxAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |
Pre-tax (gains) losses reclassified from accumulated other comprehensive income | (7.7)us-gaap_ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |
Tax effects | (1.5)us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |
Net current period other comprehensive (loss) income | (5.4)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |
Balances, April 30, 2015 | 37.4 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |
Net Unrealized Gains (Losses) on Available-for-Sale Securities |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balances, January 31, 2015 | 1.6 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Other comprehensive income (loss) before reclassifications | 0.2 us-gaap_OciBeforeReclassificationsBeforeTaxAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Pre-tax (gains) losses reclassified from accumulated other comprehensive income | 0.1 us-gaap_ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Tax effects | (0.1)us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Net current period other comprehensive (loss) income | 0.2 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Balances, April 30, 2015 | 1.8 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |
Defined Benefit Pension Components |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balances, January 31, 2015 | (23.7)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
Other comprehensive income (loss) before reclassifications | 0.4 us-gaap_OciBeforeReclassificationsBeforeTaxAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
Pre-tax (gains) losses reclassified from accumulated other comprehensive income | 0.3 us-gaap_ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
Tax effects | 0 us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
Net current period other comprehensive (loss) income | 0.7 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
Balances, April 30, 2015 | (23.0)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember |
Foreign Currency Translation Adjustments |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Balances, January 31, 2015 | (74.0)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |
Other comprehensive income (loss) before reclassifications | (2.0)us-gaap_OciBeforeReclassificationsBeforeTaxAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |
Pre-tax (gains) losses reclassified from accumulated other comprehensive income | 0 us-gaap_ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |
Tax effects | 3.8 us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |
Net current period other comprehensive (loss) income | 1.8 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |
Balances, April 30, 2015 | $ (72.2)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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- Definition Amount of tax expense (benefit) allocated to other comprehensive income (loss) attributable to parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4569616-111683 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4569643-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 + Details
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