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Related Party Transactions (Details) - Dover - USD ($) $ in Millions |  | 3 Months Ended
--- | --- | ---
Feb. 27, 2014 | Dec. 31, 2014
Related Party Transaction [Line Items] |  |
Cash paid to parent Company prior to separation | $ 400.0 |
Cash paid to former parent company for final settlement of tax matter agreement |  | $ 1.7

X
- Definition Cash Paid to Former Parent Company for Final Settlement of Tax Matter Agreement + References No definition available. + Details
Name: | kn_CashPaidtoFormerParentCompanyforFinalSettlementofTaxMatterAgreement
Namespace Prefix: | kn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Cash Paid to Former Parent Company prior to Separation + References No definition available. + Details
Name: | kn_CashPaidtoFormerParentCompanypriortoSeparation
Namespace Prefix: | kn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_AffiliatedEntityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |