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Acquisition Acquisition - Schedule of Purchase Consideration and Net Asset Allocation (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 01, 2015 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Consideration Transferred [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration paid to Audience shareholders and equity award holders |  |  |  |  |  |  |  |  |  |  |  | $ 61.6 |
Business Net Assets Acquired [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 894.6 |  |  |  | $ 925.8 |  |  |  | $ 925.8 | $ 894.6 | 925.8 | $ 914.7
Revenues |  | 240.6 | $ 243.1 | $ 190.3 | $ 185.3 | 223.5 | $ 246.7 | $ 192.8 | $ 186.6 |  | 859.3 | 849.6 | 915.0
Net (loss) earnings |  | $ 19.3 | $ (7.6) | $ (24.6) | $ (29.4) | $ (187.0) | $ (14.9) | $ (16.1) | $ (15.8) |  | $ (42.3) | $ (233.8) | $ (87.0)
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 | 48.0 |  |  |  |  |  |  |  |  |  |  |  |
Cash | 26.5 |  |  |  |  |  |  |  |  |  |  |  |
Inventories | 25.8 |  |  |  |  |  |  |  |  |  |  |  |
Property, plant, and equipment | 10.3 |  |  |  |  |  |  |  |  |  |  |  |
Other assets | 10.7 |  |  |  |  |  |  |  |  |  |  |  |
Total liabilities and accruals | (17.5) |  |  |  |  |  |  |  |  |  |  |  |
Fair value of total consideration | $ 123.3 |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable, Number of Shares for Unvested Equity Awards Assumed | 461,371.00 |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred, enterprise value, net of cash and short-term investments | $ 92.8 |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 19.0 |  |  |
Net (loss) earnings |  |  |  |  |  |  |  |  |  | $ 31.6 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets | $ 19.5 |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Inputs, Discount Rate | 27.00% |  |  |  |  |  |  |  |  |  |  |  |

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