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ACCRUED EXPENSES AND TAXES AND OTHER LONG-TERM LIABILITIES - Accrued Expenses and Taxes Included in Current Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Other Liabilities Disclosure [Abstract]    
Payroll, pension and employee benefits $ 65.0ntks_AccruedPayrollPensionAndEmployeeBenefitsCurrent $ 67.9ntks_AccruedPayrollPensionAndEmployeeBenefitsCurrent
Product liability reserves 8.7ntks_ProductLiabilityReserveCurrent 8.1ntks_ProductLiabilityReserveCurrent
Worker's compensation reserves 1.9us-gaap_WorkersCompensationLiabilityCurrent 2.5us-gaap_WorkersCompensationLiabilityCurrent
Other insurance reserves, including employee health benefit accruals 5.7us-gaap_OtherEmployeeRelatedLiabilitiesCurrent 4.7us-gaap_OtherEmployeeRelatedLiabilitiesCurrent
Interest 15.7us-gaap_InterestPayableCurrent 16.1us-gaap_InterestPayableCurrent
Exit and disposal activities 7.8us-gaap_RestructuringReserveCurrent 12.2us-gaap_RestructuringReserveCurrent
Product warranty 26.6us-gaap_ProductWarrantyAccrualClassifiedCurrent 30.4us-gaap_ProductWarrantyAccrualClassifiedCurrent
Sales and marketing expenditures 34.0ntks_AccruedSalesAndMarketingCostsCurrent 28.3ntks_AccruedSalesAndMarketingCostsCurrent
Other, net 57.0us-gaap_OtherAccruedLiabilitiesCurrent 61.3us-gaap_OtherAccruedLiabilitiesCurrent
Accrued expenses and taxes, net $ 222.4us-gaap_AccruedLiabilitiesCurrent $ 231.5us-gaap_AccruedLiabilitiesCurrent