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Retirement Benefit Plans - Balance Sheet (Details) (USD $)
In Millions, unless otherwise specified
Jan. 31, 2015
Jan. 31, 2014
Defined Benefit Plan Disclosure [Line Items]    
Amounts Recognized in Balance Sheet $ 67.1us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet $ 30.2us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet
Other long-term liabilities    
Defined Benefit Plan Disclosure [Line Items]    
Amounts Recognized in Balance Sheet 40.5us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember		 21.5us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentLiabilitiesMember
Accumulated other comprehensive loss, before tax    
Defined Benefit Plan Disclosure [Line Items]    
Amounts Recognized in Balance Sheet $ 26.6us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 $ 8.7us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember