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ACCRUED EXPENSES AND TAXES AND OTHER LONG-TERM LIABILITIES - Accrued Expenses Included in Other Long-term Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Other Liabilities Disclosure [Abstract]    
Employee pension retirement benefit obligation $ 53.3us-gaap_DefinedBenefitPensionPlanLiabilitiesNoncurrent $ 43.0us-gaap_DefinedBenefitPensionPlanLiabilitiesNoncurrent
Product warranty 28.2us-gaap_ProductWarrantyAccrualNoncurrent 26.4us-gaap_ProductWarrantyAccrualNoncurrent
Post-retirement health benefit obligations 1.4us-gaap_OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent 1.6us-gaap_OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent
Product liability reserves 32.5ntks_ProductLiabilityReserveNoncurrent 40.2ntks_ProductLiabilityReserveNoncurrent
Worker's compensation reserves 0.1us-gaap_WorkersCompensationLiabilityNoncurrent 0.2us-gaap_WorkersCompensationLiabilityNoncurrent
Other insurance reserves 3.3ntks_OtherInsuranceReservesNoncurrent 3.7ntks_OtherInsuranceReservesNoncurrent
Exit and disposal activities 0us-gaap_RestructuringReserveNoncurrent 3.0us-gaap_RestructuringReserveNoncurrent
Mexico facility 30.3us-gaap_CapitalLeaseObligationsNoncurrent 33.6us-gaap_CapitalLeaseObligationsNoncurrent
Uncertain tax positions 22.4ntks_LiabilityforUncertainTaxPositionsandRelatedInterest 24.8ntks_LiabilityforUncertainTaxPositionsandRelatedInterest
Other, net 14.4us-gaap_OtherAccruedLiabilitiesNoncurrent 12.4us-gaap_OtherAccruedLiabilitiesNoncurrent
Other long-term liabilities $ 185.9us-gaap_OtherLiabilitiesNoncurrent $ 188.9us-gaap_OtherLiabilitiesNoncurrent