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Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Jul. 01, 2015 | Feb. 28, 2014 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Reconciliation of information used in computing basic and diluted earnings per share [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) earnings |  |  |  | $ (187.0) | $ (14.9) | $ (16.1) | $ (15.8) | $ (1.1) | $ (14.6) | $ (78.9) | $ 7.6 |  | $ (233.8) | [1] | $ (87.0) | [1] | $ 105.8 | [1]
Basic (loss) earnings per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic weighted average shares outstanding (in shares) | [2] |  |  |  |  |  |  |  |  |  |  |  | 86,802,828 |  | 85,046,042 |  | 85,019,159 |
Basic (loss) earnings per share (usd per share) | [2] |  |  |  |  |  |  |  |  |  |  |  | $ (2.69) |  | $ (1.02) |  | $ 1.24 |
Diluted earnings (loss) per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic weighted average shares outstanding (in shares) | [2] |  |  |  |  |  |  |  |  |  |  |  | 86,802,828 |  | 85,046,042 |  | 85,019,159 |
Dilutive effect of stock-based awards (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Dilutive weighted average shares outstanding (in shares) | [2] |  |  |  |  |  |  |  |  |  |  |  | 86,802,828 |  | 85,046,042 |  | 85,019,159 |
Diluted (loss) earnings per share (usd per share) | [2] |  |  |  |  |  |  |  |  |  |  |  | $ (2.69) |  | $ (1.02) |  | $ 1.24 |
Stock issued during period (in shares) |  |  | 0.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of anti-dilutive shares excluded from the calculation (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 3,357,320 |  |  |  |  |
Audience, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued (in shares) |  | 3,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable, Number of Shares for Unvested Equity Awards Assumed |  | 461,371.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reconciliation of information used in computing basic and diluted earnings per share [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) earnings |  |  |  |  |  |  |  |  |  |  |  | $ 31.6 |  |  |  |  |  |
[1] | Years Ended December 31, 2015 2014 2013Revenue: Mobile Consumer Electronics$656.7 $684.1 $777.2Specialty Components427.9 457.2 437.7Intra-segment eliminations— — (0.1)Total consolidated revenue$1,084.6 $1,141.3 $1,214.8 (Loss) earnings before interest and income taxes: Mobile Consumer Electronics$(240.8) $(74.6) $122.0Specialty Components61.0 69.5 65.0Total segments(179.8) (5.1) 187.0Corporate expense / other56.4 43.4 43.5Interest expense, net12.7 6.6 42.0(Loss) earnings before income taxes(248.9) (55.1) 101.5(Benefit from) provision for income taxes(15.1) 31.9 (4.3)Net (loss) earnings$(233.8) $(87.0) $105.8 Depreciation and amortization: Mobile Consumer Electronics$107.9 $143.0 $100.3Specialty Components25.1 24.8 28.8Corporate2.7 2.1 1.8Total$135.7 $169.9 $130.9 Capital expenditures: Mobile Consumer Electronics$43.5 $71.0 $66.4Specialty Components19.9 16.6 21.7Corporate5.6 4.7 3.2Total$69.0 $92.3 $91.3 Research and development: Mobile Consumer Electronics$83.9 $55.1 $53.5Specialty Components28.2 27.9 29.1Total$112.1 $83.0 $82.6
[2] | On February 28, 2014, Dover stockholders of record as of the close of business on February 19, 2014 received one share of Knowles common stock for every two shares of Dover's common stock held as of the record date. The computation of basic and diluted earnings per common share for all periods through December 31, 2013 was calculated using the shares distributed on February 28, 2014.

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