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INCOME TAXES - Deferred Income Tax Assets and Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred Tax Assets    
Accounts receivable $ 5.9ntks_DeferredTaxAssetsAccountsReceivableCurrent $ 3.9ntks_DeferredTaxAssetsAccountsReceivableCurrent
Inventories 1.5us-gaap_DeferredTaxAssetsInventory 0us-gaap_DeferredTaxAssetsInventory
Warranty accruals 18.7us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves 20.6us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves
Other assets 33.5us-gaap_DeferredTaxAssetsOther 25.0us-gaap_DeferredTaxAssetsOther
Goodwill 23.3us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets 30.0us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets
Insurance reserves 15.1us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSelfInsurance 18.0us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSelfInsurance
Prepaid pension assets 18.0us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions 12.6us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions
Capital losses and carry forwards 1.2us-gaap_DeferredTaxAssetsCapitalLossCarryforwards 1.0us-gaap_DeferredTaxAssetsCapitalLossCarryforwards
Net operating losses 53.0us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 48.1us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Deferred tax assets, Gross 170.2us-gaap_DeferredTaxAssetsGross 159.2us-gaap_DeferredTaxAssetsGross
Valuation allowances (54.3)us-gaap_DeferredTaxAssetsValuationAllowanceCurrent (46.2)us-gaap_DeferredTaxAssetsValuationAllowanceCurrent
Net Deferred Tax Assets 115.9us-gaap_DeferredTaxAssetsNet 113.0us-gaap_DeferredTaxAssetsNet
Deferred Tax Liabilities    
Property and equipment, net (14.3)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (14.1)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Intangible assets, net (191.1)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (227.7)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Other reserves, liabilities and assets, net (5.9)us-gaap_DeferredTaxLiabilitiesOther (0.6)us-gaap_DeferredTaxLiabilitiesOther
Deferred tax liabilities, Gross (211.3)us-gaap_DeferredIncomeTaxLiabilities (242.4)us-gaap_DeferredIncomeTaxLiabilities
Net Deferred Tax Liabilities 95.4us-gaap_DeferredTaxLiabilities 129.4us-gaap_DeferredTaxLiabilities
Current deferred tax assets 28.1us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 29.7us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Noncurrent deferred income taxes $ 123.5us-gaap_DeferredTaxLiabilitiesNoncurrent $ 159.1us-gaap_DeferredTaxLiabilitiesNoncurrent