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SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS - (Details) (Allowance for Doubtful Accounts and Sales Allowance [Member], USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Allowance for Doubtful Accounts and Sales Allowance [Member]
     
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year $ 4.2us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= ntks_AllowanceForDoubtfulAccountsAndSalesAllowanceMember
$ 7.2us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= ntks_AllowanceForDoubtfulAccountsAndSalesAllowanceMember
$ 5.2us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= ntks_AllowanceForDoubtfulAccountsAndSalesAllowanceMember
Charged to Cost and Expense 2.3us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= ntks_AllowanceForDoubtfulAccountsAndSalesAllowanceMember
0.6us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= ntks_AllowanceForDoubtfulAccountsAndSalesAllowanceMember
3.3us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= ntks_AllowanceForDoubtfulAccountsAndSalesAllowanceMember
Charged to Other Accounts (0.3)us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= ntks_AllowanceForDoubtfulAccountsAndSalesAllowanceMember
[1] 0us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= ntks_AllowanceForDoubtfulAccountsAndSalesAllowanceMember
[1] 1.0us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= ntks_AllowanceForDoubtfulAccountsAndSalesAllowanceMember
[1]
Deduction from Reserves (2.5)us-gaap_ValuationAllowancesAndReservesDeductions
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= ntks_AllowanceForDoubtfulAccountsAndSalesAllowanceMember
[2] (3.6)us-gaap_ValuationAllowancesAndReservesDeductions
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= ntks_AllowanceForDoubtfulAccountsAndSalesAllowanceMember
[2] (2.3)us-gaap_ValuationAllowancesAndReservesDeductions
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= ntks_AllowanceForDoubtfulAccountsAndSalesAllowanceMember
[2]
Balance at End of Year $ 3.7us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= ntks_AllowanceForDoubtfulAccountsAndSalesAllowanceMember
$ 4.2us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= ntks_AllowanceForDoubtfulAccountsAndSalesAllowanceMember
$ 7.2us-gaap_ValuationAllowancesAndReservesBalance
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= ntks_AllowanceForDoubtfulAccountsAndSalesAllowanceMember
[1] Other, including the effect of changes in foreign currency exchange rates.
[2] Amounts written off, net of recoveries.