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Acquisition Acquisition - Schedule of Purchase Consideration and Net Asset Allocation (Details) - USD ($) $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 01, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Consideration Transferred [Abstract] |  |  |  |
Cash consideration paid to Audience shareholders and equity award holders |  | $ 61.6 |  |
Business Net Assets Acquired [Abstract] |  |  |  |
Goodwill |  | $ 925.8 | $ 914.7 | $ 961.9
Audience, Inc. |  |  |  |
Consideration Transferred [Abstract] |  |  |  |
Cash consideration paid to Audience shareholders and equity award holders | $ 61.6 |  |  |
Fair value of shares of Knowles common stock issued to Audience shareholders and equity award holders | 60.2 |  |  |
Fair value of restricted stock units assumed | 1.5 |  |  |
Fair value of total consideration | 123.3 |  |  |
Business Net Assets Acquired [Abstract] |  |  |  |
Goodwill | 47.8 |  |  |
Cash | 26.5 |  |  |
Identified intangible assets | 25.8 |  |  |
Inventories | 10.3 |  |  |
Property, plant, and equipment | 10.7 |  |  |
Other assets | 19.5 |  |  |
Total liabilities and accruals | (17.3) |  |  |
Fair value of total consideration | $ 123.3 |  |  |

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- Definition The amount of inventory recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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