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Supplemental Cash Flow Information (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Supplemental Cash Flow Information [Abstract]      
Cash paid for interest $ 5.3us-gaap_InterestPaid $ 4.8us-gaap_InterestPaid $ 5.1us-gaap_InterestPaid
Cash paid for income taxes 171.4us-gaap_IncomeTaxesPaidNet 130.1us-gaap_IncomeTaxesPaidNet 95.2us-gaap_IncomeTaxesPaidNet
Non-cash item in deferred tax liabilities and intangibles in conjunction with acquisition   7.0nus_OtherSignificantNoncashTransactionValueOfConsiderationNonCashItemInDeferredTaxLiabilitiesAndIntangiblesInConjunctionWithAcquisition  
Non-cash addition of fixed assets   9.2us-gaap_NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1 5.5us-gaap_NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1
Noncash charges to fixed assets associated with Korea building lease 19.4nus_NoncashChargesToFixedAssetsAssociatedWithAccountingForBuildingLease    
Noncash increase of long term liabilities 16.7nus_NoncashChargesToFixedAssetsAssociatedWithLongTermLiabilities    
Noncash decrease of long term assets $ (2.7)nus_NoncashChargesToFixedAssetsAssociatedWithLongTermAssets