Knowles (KN) 10-Q 28 Apr 22 2022 Q1 Quarterly report Financial data

Cover

Cover - shares	3 Months Ended
	Mar. 31, 2022	Apr. 26, 2022
Cover [Abstract]
Document Quarterly Report	true
Document Transition Report	false
Entity File Number	001-36102
Entity Registrant Name	Knowles Corporation
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	90-1002689
Entity Address, Address Line One	1151 Maplewood Drive,
Entity Address, City or Town	Itasca,
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60143
City Area Code	(630)
Local Phone Number	250-5100
Title of 12(b) Security	Common stock, $0.01 par value per share
Trading Symbol	KN
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		91,754,530
Document Type	10-Q
Entity Central Index Key	0001587523
Current Fiscal Year End Date	--12-31
Document Period End Date	Mar. 31, 2022
Document Fiscal Period Focus	Q1
Amendment Flag	false
Document Fiscal Year Focus	2022

CONSOLIDATED STATEMENTS OF EARN

CONSOLIDATED STATEMENTS OF EARNINGS (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
Revenues	$ 201.4	$ 201
Cost of goods sold	118.1	123
Gross profit	83.3	78
Research and development expenses	23.1	23.3
Selling and administrative expenses	32.3	36.2
Restructuring charges	6.6	0.2
Operating expenses	62	59.7
Operating earnings	21.3	18.3
Interest expense, net	0.8	4
Other income, net	(0.5)	(0.9)
Earnings before income taxes	21	15.2
Provision for income taxes	2.9	2.7
Earnings (loss) from continuing operations	18.1	12.5
Net earnings	$ 18.1	$ 12.5
Earnings per share:
Net earnings (loss) per share, basic	$ 0.20	$ 0.14
Net earnings (loss) per share, diluted	$ 0.19	$ 0.13
Weighted-average common shares outstanding:
Basic (in shares)	92,300,000	92,300,000
Diluted (in shares)	94,300,000	95,000,000

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net earnings	$ 18.1	$ 12.5
Foreign currency translation	(2.2)	(3.6)
Employee benefit plans:
Amortization or settlement of actuarial losses and prior service costs	0.1	0.2
Net change in employee benefit plans	0.1	0.2
Changes in fair value of cash flow hedges:
Unrealized net losses arising during period	0	(0.8)
Net gains reclassified into earnings	(0.3)	(1)
Total cash flow hedges	(0.3)	(1.8)
Other comprehensive loss, net of tax	(2.4)	(5.2)
Comprehensive earnings	$ 15.7	$ 7.3

CONSOLIDATED BALANCE SHEETS (Un

CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 50.7	$ 68.9
Accounts Receivable, after Allowance for Credit Loss, Current	143.1	146.6
Inventories, net	177	153.1
Prepaid and other current assets	13.1	11.7
Total current assets	383.9	380.3
Property, plant, and equipment, net	191.7	200.8
Goodwill	942	941.3
Intangible assets, net	94.2	97.3
Operating Lease, Right-of-Use Asset	15.9	17.4
Other assets and deferred charges	(91)	(94.5)
Total assets	1,718.7	1,731.6
Current liabilities:
Accounts payable	81.3	90.9
Accrued compensation and employee benefits	24.4	42.8
Operating Lease, Liability, Current	9.8	11.4
Other accrued expenses	23.7	19.4
Federal and other taxes on income	3.8	1.7
Total current liabilities	143	166.2
Long-term debt	70	70
Deferred Income Tax Liabilities, Net	0.6	0.6
Operating Lease, Liability, Noncurrent	12.5	14.7
Other liabilities	18.5	20.6
Commitments and contingencies (Note 13)
Stockholders' equity:
Preferred Stock, Value, Issued	0	0
Common Stock, Value, Issued	1	1
Treasury Stock, Value	(66.1)	(62.4)
Additional paid-in capital	1,642	1,639.4
Accumulated deficit	0	(18.1)
Accumulated other comprehensive loss	(102.8)	(100.4)
Total stockholders' equity	1,474.1	1,459.5
Total liabilities and stockholders' equity	$ 1,718.7	$ 1,731.6
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01
Common stock, shares authorized (in shares)	400,000,000
Common stock, shares issued (in shares)	96,018,208	95,112,778
Common Stock, Shares, Outstanding	92,690,630	91,894,980
Treasury Stock, Shares	3,327,578	3,217,798

CONSOLIDATED BALANCE SHEETS (_2

CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) $ in Millions	Mar. 31, 2022USD ($)$ / sharesshares
Current assets:
Allowance for doubtful accounts receivable | $	$ 0.2
Preferred stock, par value (in dollars per share) | $ / shares	$ 0.01
Preferred stock, shares authorized (in shares)	10,000,000
Preferred stock, shares issued (in shares)	0
Common stock, par value (in dollars per share) | $ / shares	$ 0.01
Common stock, shares authorized (in shares)	400,000,000
Common stock, shares issued (in shares)	96,018,208
Treasury Stock, Shares	3,327,578

CONSOLIDATED STATEMENT OF STOCK

CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (unaudited) - USD ($) $ in Millions	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock, shares issued (in shares)		92,689,912
Treasury Stock, Shares			(1,078,363)
Balance at Dec. 31, 2020	$ 1,303.5	$ 0.9	$ (16.2)	$ 1,587.8	$ (168.5)	$ (100.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	12.5
Earnings (loss) from continuing operations	12.5
Other comprehensive (loss) earnings, net of tax	(5.2)					(5.2)
Stock-based compensation expense	11.1			11.1
Stock Issued During Period, Shares, New Issues		524,864
Stock Issued During Period, Value, Stock Options Exercised	8.4	$ 0		8.4
Restricted Stock, Shares Issued Net of Shares for Tax Withholdings		622,894
Balance at Mar. 31, 2021	1,323.7	$ 0.9	(16.2)	1,600.7	(156)	(105.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	(0.1)
Restricted Stock, Value, Shares Issued Net of Tax Withholdings	(6.6)			(6.6)
Balance at Dec. 31, 2020	1,303.5	0.9	(16.2)	1,587.8	(168.5)	(100.5)
Balance at Dec. 31, 2021	1,459.5	$ 1	$ (62.4)	1,639.4	(18.1)	(100.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Issued During Period, Shares, Conversion of Convertible Securities			400,000
Common stock, shares issued (in shares)		93,837,670
Treasury Stock, Shares			(1,078,363)
Treasury Stock, Value	$ 62.4
Common stock, shares issued (in shares)	95,112,778	95,112,778
Treasury Stock, Shares	3,217,798		(3,217,798)
Net earnings	$ 18.1
Stock Repurchased During Period, Value			$ (6.8)
Earnings (loss) from continuing operations	18.1
Other comprehensive (loss) earnings, net of tax	(2.4)					(2.4)
Stock-based compensation expense	7.6			7.6
Stock Issued During Period, Shares, New Issues		332,336
Stock Issued During Period, Value, Stock Options Exercised	4.2	$ 0		4.2
Restricted Stock, Shares Issued Net of Shares for Tax Withholdings		573,094
Balance at Mar. 31, 2022	1,474.1	$ 1	$ (66.1)	1,642	$ 0	$ (102.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock Repurchased During Period, Shares			(313,395)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	0.1
Shares Issued During Period, Value, Exercise of Warrants	0		$ 3.1	3.1
Shares Issued During Period, Shares, Exercise of Warrants			203,615
Restricted Stock, Value, Shares Issued Net of Tax Withholdings	(6.1)			$ (6.1)
Treasury Stock, Value	$ 66.1
Common stock, shares issued (in shares)	96,018,208	96,018,208
Treasury Stock, Shares	3,327,578		(3,327,578)

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Proceeds from the sale of business	$ 0	$ 2.1
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations	50.7	181.6
Adjustments to reconcile net earnings to cash from operating activities:
Increase (Decrease) in Other Noncurrent Assets and Liabilities, Net	1.7	2.2
Gain (Loss) on Disposition of Property Plant Equipment	0	(0.3)
Depreciation and amortization	14.8	15.1
Stock-based compensation	7.6	11.1
Non-cash interest expense and amortization of debt issuance costs	0.2	2.3
Deferred income taxes	2.9	0
Other, net	0.6	(1.5)
Changes in assets and liabilities (excluding effects of foreign exchange):
Increase (Decrease) in Other Noncurrent Assets and Liabilities, Net	1.7	2.2
Increase (Decrease) in Prepaid Expense and Other Assets	1.7	3.3
Other accrued expenses	4.5	0.1
Receivables, net	3.4	16.6
Inventories, net	(24.6)	(12.9)
Prepaid and other current assets	(1.7)	(3.3)
Accounts payable	(7.1)	10.8
Accrued compensation and employee benefits	(18.2)	(7.7)
Increase Decrease Accrued Taxes, Net	2	(0.9)
Net Cash Provided by (Used in) Operating Activities	0.8	39.7
Investing Activities
Net Cash Provided by (Used in) Investing Activities, Total	(6.8)	(7)
Capital expenditures	(6.8)	(5.2)
Payments for (Proceeds from) Investments	0	(2.1)
Proceeds from Sale of Property, Plant, and Equipment	0	0.3
Financing Activities
Net Cash Provided by (Used in) Financing Activities, Total	(12)	1.2
Payments for Repurchase of Common Stock	6.8	0
Tax on restricted and performance stock unit vesting	(6.1)	(6.6)
Payments of finance lease obligations	(3)	(0.6)
Proceeds from exercise of stock options	3.9	8.4
Effect of Exchange Rate on Cash and Cash Equivalents [Abstract]
Effect of exchange rate changes on cash and cash equivalents	(0.2)	(0.1)
Net earnings	18.1	12.5
Net (decrease) increase in cash and cash equivalents	(18.2)	33.8
Supplemental information - cash paid for:
Income taxes	1.5	4.5
Interest	$ 0.7	$ 0.4

Recent Accounting Standards (No

Recent Accounting Standards (Notes)	3 Months Ended
	Mar. 31, 2022
Accounting Standards Update and Change in Accounting Principle [Abstract]
Recent Accounting Standards	Recently Adopted Accounting Standards In August 2020, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2020-06 to simplify the accounting for certain financial instruments with characteristics of liabilities and equity. The standard eliminates certain accounting models that separated embedded conversion features from host contracts for convertible instruments, requiring bifurcation only if the convertible feature qualifies as a derivative under Accounting Standards Codification ("ASC") 815 or for convertible instruments issued at a substantial premium. In addition, the guidance requires the if-converted method of calculating diluted earnings per share for convertible instruments, which eliminates the use of the treasury stock method for instruments that may be settled in cash or shares. The standard can be adopted on a modified retrospective basis to transactions outstanding as of the adoption date or on a fully retrospective basis to all periods presented. The Company adopted the standard using the modified retrospective method on January 1, 2022. Adoption of the standard did not impact the Consolidated Financial Statements as all of the Company’s convertible instruments were settled prior to the adoption date. See Note 8. Borrowings for detail on the Company's convertible instruments that matured on November 1, 2021.

Inventories, net (Notes)

Inventories, net (Notes)	3 Months Ended
	Mar. 31, 2022
Inventory, Net [Abstract]
Inventories, net	The following table details the major components of inventories, net: (in millions) March 31, 2022 December 31, 2021 Raw materials $ 110.6 $ 89.6 Work in progress 35.5 33.6 Finished goods 68.9 66.7 Subtotal 215.0 189.9 Less reserves (38.0) (36.8) Total $ 177.0 $ 153.1

Property, Plant, and Equipment,

Property, Plant, and Equipment, net (Notes)	3 Months Ended
	Mar. 31, 2022
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment, net	5. Property, Plant, and Equipment, net The following table details the major components of property, plant, and equipment, net: (in millions) March 31, 2022 December 31, 2021 Land $ 12.8 $ 12.9 Buildings and improvements 119.2 119.3 Machinery, equipment, and other 575.3 575.0 Subtotal 707.3 707.2 Less accumulated depreciation (515.6) (506.4) Total $ 191.7 $ 200.8

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets (Notes)	3 Months Ended
	Mar. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	The changes in the carrying value of goodwill by reportable segment for the three months ended March 31, 2022 are as follows: (in millions) Audio Precision Devices Total Balance at December 31, 2021 $ 878.8 $ 62.5 $ 941.3 Purchase price adjustment — 0.7 0.7 Balance at March 31, 2022 $ 878.8 $ 63.2 $ 942.0 The gross carrying value and accumulated amortization for each major class of intangible assets are as follows: March 31, 2022 December 31, 2021 (in millions) Gross Carrying Accumulated Gross Carrying Accumulated Amortized intangible assets: Trademarks $ 2.0 $ 0.7 $ 2.0 $ 0.6 Customer relationships 36.4 7.0 36.4 5.9 Developed technology 45.4 14.9 45.4 13.2 Other 2.4 1.4 2.4 1.2 Total 86.2 24.0 86.2 20.9 Unamortized intangible assets: Trademarks 32.0 32.0 Total intangible assets, net $ 94.2 $ 97.3 Amortization expense totaled $3.1 million and $3.3 million for the three months ended March 31, 2022 and 2021, respectively. Amortization expense for the next five years, based on current definite-lived intangible balances, is estimated to be as follows: (in millions) Q2-Q4 2022 $ 9.1 2023 11.6 2024 11.6 2025 11.2 2026 5.3

Other Comprehensive Earnings

Other Comprehensive Earnings	3 Months Ended
	Mar. 31, 2022
Statement of Other Comprehensive Income [Abstract]
Other Comprehensive Earnings	The amounts recognized in other comprehensive loss were as follows: Three Months Ended Three Months Ended March 31, 2022 March 31, 2021 (in millions) Pre-tax Tax Net of tax Pre-tax Tax Net of tax Foreign currency translation $ (2.2) $ — $ (2.2) $ (3.6) $ — $ (3.6) Employee benefit plans 0.2 (0.1) 0.1 0.2 — 0.2 Changes in fair value of cash flow hedges (0.3) — (0.3) (1.9) 0.1 (1.8) Total other comprehensive loss $ (2.3) $ (0.1) $ (2.4) $ (5.3) $ 0.1 $ (5.2) The following tables summarize the changes in balances of each component of accumulated other comprehensive loss, net of tax during the three months ended March 31, 2022 and 2021: (in millions) Cash flow hedges Employee benefit plans Cumulative foreign currency translation adjustments Total Balance at December 31, 2021 $ 0.3 $ (17.1) $ (83.6) $ (100.4) Other comprehensive (loss) earnings, net of tax (0.3) 0.1 (2.2) (2.4) Balance at March 31, 2022 $ — $ (17.0) $ (85.8) $ (102.8) (in millions) Cash flow hedges Employee benefit plans Cumulative foreign currency translation adjustments Total Balance at December 31, 2020 $ 1.6 $ (22.1) $ (80.0) $ (100.5) Other comprehensive (loss) earnings, net of tax (1.8) 0.2 (3.6) (5.2) Balance at March 31, 2021 $ (0.2) $ (21.9) $ (83.6) $ (105.7) The following table summarizes the amounts reclassified from accumulated other comprehensive loss to earnings: Three Months Ended March 31, (in millions) Statement of Earnings Line 2022 2021 Pension and post-retirement benefit plans: Amortization or settlement of actuarial losses and prior service costs Other income, net $ 0.2 $ 0.2 Tax Provision for income taxes (0.1) — Net of tax $ 0.1 $ 0.2 Cash flow hedges: Net gains reclassified into earnings Cost of goods sold $ (0.3) $ (1.3) Tax Provision for income taxes — 0.3 Net of tax $ (0.3) $ (1.0)

Income Taxes (Notes)

Income Taxes (Notes)	3 Months Ended
	Mar. 31, 2022
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Text Block]	The Company's ETR for the three months ended March 31, 2022 and 2021 was a 13.8% provision (inclusive of discrete items totaling $1.0 million of benefit) and a 17.8% provision (inclusive of discrete items totaling $0.1 million of benefit), respectively. The discrete items impacting the tax provision for the three months ended March 31, 2022 were primarily attributable to the stock-based compensation deduction. Absent the discrete items, the ETR for the three months ended March 31, 2022 and 2021 was an 18.6% provision and an 18.4% provision, respectively. The Company accrues taxes in various countries where it generates income and applies a valuation allowance in other jurisdictions, which resulted in the provision for the three months ended March 31, 2022 and 2021. The Company's ETR is favorably impacted by tax holidays granted to the Company in Malaysia and China. The Company secured the Chinese tax holiday in the first quarter of 2022. These tax holidays are subject to the Company's annual satisfaction of certain conditions, including investment and sales thresholds. If the Company fails to satisfy such conditions, the Company's ETR may be significantly adversely impacted. The benefit of the tax holidays in Malaysia and China for the three months ended March 31, 2022 was approximately $2.6 million, or $0.03 on a basic per share basis. The benefit of these incentives for the three months ended March 31, 2021 was approximately $2.4 million, or $0.03 on a basic per share basis. The Company's existing significant tax holiday in Malaysia will expire on December 31, 2026, while the tax holiday in China will expire on December 31, 2023.

Equity Incentive Program (Notes

Equity Incentive Program (Notes)	3 Months Ended
	Mar. 31, 2022
Share-based Payment Arrangement, Noncash Expense [Abstract]
Equity Incentive Program	Stock-based compensation expense recognized in the Consolidated Statements of Earnings totaled $7.6 million and $11.1 million for the three months ended March 31, 2022 and 2021, respectively. The tax benefit recognized related to stock-based compensation expense was $3.2 million for the three months ended March 31, 2022. No tax benefit was recognized related to stock-based compensation expense for the three months ended March 31, 2021. Stock Options and SSARs The expense related to stock options granted in the three months ended March 31, 2022 and 2021 was estimated on the date of grant using a Black-Scholes option-pricing model based on the assumptions shown in the table below: Three Months Ended March 31, 2022 2021 Risk-free interest rate 0.85% 0.06% Dividend yield —% —% Expected life (years) 4.5 4.5 Volatility 34.3% 36.0% Fair value at date of grant $6.29 $6.14 The following table summarizes the Company's stock-settled stock appreciation right ("SSAR") and stock option activity for the three months ended March 31, 2022: SSARs Stock Options Number of Shares Weighted-Average Exercise Price Aggregate Intrinsic Value Weighted-Average Remaining Contractual Term (Years) Number of Shares Weighted-Average Exercise Price Aggregate Intrinsic Value Weighted-Average Remaining Contractual Term (Years) (in millions, except share and per share amounts) Outstanding at December 31, 2021 375,964 $ 23.16 3,478,438 $ 15.04 Granted — — 216,813 21.14 Exercised (36,759) 21.77 (332,336) 12.62 Forfeited — — (6,244) 20.60 Expired (95,573) 21.77 — — Outstanding at March 31, 2022 243,632 $ 23.92 $ — 0.9 3,356,671 $ 15.67 $ 19.7 3.3 Exercisable at March 31, 2022 243,632 $ 23.92 $ — 0.9 2,773,567 $ 14.91 $ 18.4 2.7 There was no unrecognized compensation expense related to SSARs at March 31, 2022. At March 31, 2022, unrecognized compensation expense related to stock options not yet exercisable of $2.9 million is expected to be recognized over a weighted-average period of 1.8 years. RSUs The following table summarizes the Company's restricted stock unit ("RSU") activity for the three months ended March 31, 2022: Share units Weighted-average grant date fair value Unvested at December 31, 2021 1,778,639 $ 18.89 Granted 997,294 21.14 Vested (1) (722,073) 17.98 Forfeited (65,911) 19.50 Unvested at March 31, 2022 1,987,949 $ 20.28 (1) The number of RSUs vested includes shares that the Company withheld on behalf of employees to satisfy statutory tax withholding requirements. At March 31, 2022, $32.6 million of unrecognized compensation expense related to RSUs is expected to be recognized over a weighted-average period of 2.2 years. PSUs The Company grants performance share units (“PSUs”) to senior management. In each case, the awards will cliff vest three years following the grant date. PSUs will be settled in shares of the Company's common stock. Depending on the Company's overall performance relative to the applicable measures, the size of the PSU awards are subject to adjustment, up or down, resulting in awards at the end of the performance period that can range from 0% to 225% of target. The Company will ratably recognize the expense over the applicable service period for each grant of PSUs and adjust the expense for the expected achievement of performance conditions as appropriate. The fair value of PSUs is determined by using a Monte Carlo simulation. For the awards granted in February 2022 and 2021, the number of PSUs that may be earned and vest is based on total shareholder return (“TSR”) relative to the component companies of the Russell 2000 Index over a three-year performance period. The COVID-19 pandemic brought on unique and unprecedented challenges to the Company, particularly in the hearing health and medtech markets. Many of the Company's executive compensation programs were affected, including outstanding PSU awards. Due to the impact of the COVID-19 pandemic on the Company’s overall business performance, effective February 8, 2021, the Company’s Compensation Committee approved certain modifications to PSUs granted in February 2018, 2019, and 2020. For the awards granted in February 2018 (the “2018 PSUs”), the number of PSUs that may be earned and vest was originally based on the Company’s revenues and stock price performance over a three-year performance period. The modified award was based on the Company’s revenues and stock price performance over three separate one-year performance periods to isolate the impact of the COVID-19 pandemic on the Company's fiscal 2020 performance. In addition, the performance periods corresponding to fiscal 2018 and 2019 were weighted at 25% each while the performance period corresponding to fiscal 2020 was weighted at 50%, given the impact of fiscal 2020 performance on shareholders. Service conditions were not modified. The modification of the 2018 PSUs affected nine employees and resulted in total incremental compensation expense of $3.9 million, which was recognized in the first quarter of 2021 as there was no remaining service period. In February 2021, the 2018 PSUs were converted from 329,092 PSUs to 190,544 shares of common stock based on achievement of the modified conditions. For the awards granted in February 2019 (the “2019 PSUs”), the number of PSUs that may be earned and vest was originally based on the Company's revenues and TSR relative to the component companies of the S&P Semiconductor Select Industry Index over a three-year performance period. The modified award was based on the Company’s revenues and TSR relative to the component companies of the S&P Semiconductor Select Industry Index over three separate one-year performance periods to isolate the impact of the COVID-19 pandemic on the Company's fiscal 2020 performance. Each period was weighted equally, as the Company expected to face challenges related to the COVID-19 pandemic in fiscal 2021. Service conditions were not modified. The modification of the 2019 PSUs affected eight employees and resulted in total incremental compensation expense of $2.4 million, which was recognized over the remaining service period. Incremental compensation expense was subject to adjustment for the achievement of the performance condition based on fiscal 2021 revenues. In February 2022, the 2019 PSUs were converted from 227,812 PSUs to 150,811 shares of common stock based on achievement of the modified conditions. For the awards granted in February 2020 (the “2020 PSUs”), the number of PSUs that may be earned and vest was originally based on TSR relative to the component companies of the S&P Semiconductor Select Industry Index over a three-year performance period. The modified award replaces the S&P Semiconductor Select Industry Index with the Russell 2000 Index. The Company is a member of the Russell 2000 Index, which represents a broader, more diversified index that better aligns with the Company's strategy. Service conditions were not modified. The modification of the 2020 PSUs affected eight employees and resulted in total incremental compensation expense of $4.7 million, which will be recognized over the remaining service period. The following table summarizes the Company's PSU activity for the three months ended March 31, 2022: Share units Weighted-average grant date fair value Unvested at December 31, 2021 766,466 $ 21.28 Granted 294,935 29.92 Vested (1) (227,812) 18.44 Forfeited — — Unvested at March 31, 2022 833,589 $ 25.12 (1) The number of PSUs vested includes shares that the Company withheld on behalf of employees to satisfy statutory tax withholding requirements. At March 31, 2022, $16.5 million of unrecognized compensation expense related to PSUs is expected to be recognized over a weighted-average period of 1.9 years.

Earnings per Share (Notes)

Earnings per Share (Notes)	3 Months Ended
	Mar. 31, 2022
Earnings Per Share [Abstract]
Earnings per Share	Basic and diluted earnings per share were computed as follows: Three Months Ended March 31, (in millions, except per share amounts) 2022 2021 Net earnings $ 18.1 $ 12.5 Basic: Net earnings per share $ 0.20 $ 0.14 Weighted-average shares outstanding 92.3 92.3 Diluted: Net earnings per share $ 0.19 $ 0.13 Weighted-average shares outstanding 94.3 95.0 The Company intended to settle the principal amount of the Notes in cash during all periods preceding settlement. The treasury stock method was used to calculate the dilutive effect of the conversion option on diluted earnings per share, if applicable. For the three months ended March 31, 2022 and 2021, the weighted-average number of anti-dilutive potential common shares for stock-based awards excluded from the diluted earnings per share calculation above was 0.5 million and 1.8 million, respectively.

Commitments and Contingent Liab

Commitments and Contingent Liabilities (Notes)	3 Months Ended
	Mar. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingent Liabilities	March 31, 2022 and December 31, 2021.

Segment Information (Notes)

Segment Information (Notes)	3 Months Ended
	Mar. 31, 2022
Segment Reporting [Abstract]
Segment Information	The Company's two reportable segments are Audio and Precision Devices. Information regarding the Company's reportable segments is as follows: Three Months Ended March 31, (in millions) 2022 2021 Revenues: Audio $ 145.7 $ 163.1 Precision Devices 55.7 37.9 Total revenues $ 201.4 $ 201.0 Earnings before interest and income taxes: Audio $ 22.2 $ 30.4 Precision Devices 12.3 4.5 Total segments 34.5 34.9 Corporate expense / other 12.7 15.7 Interest expense, net 0.8 4.0 Earnings before income taxes 21.0 15.2 Provision for income taxes 2.9 2.7 Net earnings $ 18.1 $ 12.5 Information regarding assets of the Company's reportable segments: Total Assets (in millions) March 31, 2022 December 31, 2021 Audio $ 1,440.8 $ 1,467.1 Precision Devices 274.5 260.4 Corporate / eliminations 3.4 4.1 Total $ 1,718.7 $ 1,731.6 The following table details revenues by geographic location. Revenues are attributed to regions based on the location of the Company's direct customer, which in some instances is an intermediary and not necessarily the end user. The Company's businesses are based primarily in Asia, North America, and Europe. Three Months Ended March 31, (in millions) 2022 2021 Asia $ 128.9 $ 148.1 United States 40.9 31.5 Europe 28.1 19.2 Other Americas 1.5 1.2 Other 2.0 1.0 Total $ 201.4 $ 201.0 Receivables, net from contracts with customers were $128.6 million and $137.7 million as of March 31, 2022 and December 31, 2021, respectively. As of March 31, 2022 and December 31, 2021, our total remaining performance obligations were immaterial.

Basis of Presentation (Policies

Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Accounting Policy	Description of Business - Knowles Corporation (NYSE:KN) is a market leader and global provider of advanced micro-acoustic microphones and balanced armature speakers, audio solutions, and high performance capacitors and radio frequency ("RF") products, serving the consumer electronics, medtech, defense, electric vehicle, industrial, and communications markets. The Company uses its leading position in SiSonic TM micro-electro-mechanical systems ("MEMS") microphones and strong capabilities in audio processing technologies to optimize audio systems and improve the user experience across consumer applications. Knowles is also a leader in hearing health acoustics, high performance capacitors, and RF solutions for a diverse set of markets. The Company's focus on the customer, combined with its unique technology, proprietary manufacturing techniques, and global operational expertise, enable the Company to deliver innovative solutions across multiple applications. References to "Knowles," "the Company," "we," "our," and "us" refer to Knowles Corporation and its consolidated subsidiaries. Financial Statement Presentation - The accompanying unaudited interim Consolidated Financial Statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission ("SEC") for quarterly reports on Form 10-Q and do not include all of the information and note disclosures required by U.S. generally accepted accounting principles (“GAAP” or “U.S. GAAP”) for complete financial statements. These unaudited interim Consolidated Financial Statements should therefore be read in conjunction with the Consolidated Financial Statements and Notes thereto for the year ended December 31, 2021 included in the Company’s Annual Report on Form 10-K. The accompanying unaudited interim Consolidated Financial Statements have been prepared in accordance with U.S. GAAP, which requires management to make estimates and assumptions that affect amounts reported in the Consolidated Financial Statements and accompanying disclosures. Although these estimates are based on management’s best knowledge of current events and actions that the Company may undertake in the future, actual results may differ from those estimates. Management uses historical experience and all available information to make these estimates, including considerations for the impact of the COVID-19 pandemic on the macroeconomic environment. The situation related to the COVID-19 pandemic continues to be complex and dynamic. The Company cannot reasonably estimate the duration of the COVID-19 pandemic or fully ascertain its impact on the Company’s future results and market capitalization, which could adversely impact estimates such as the recoverability of goodwill and long-lived assets and the realizability of deferred tax assets. The unaudited interim Consolidated Financial Statements reflect all adjustments of a normal, recurring nature that are, in the opinion of management, necessary for a fair statement of results for these interim periods. Share Repurchase Program - On February 24, 2020, the Company announced that its Board of Directors had authorized a share repurchase program of up to $100 million of the Company's common stock. On April 28, 2022, the Company announced that its Board of Directors had increased the authorization by up to $150 million in additional aggregate value. The timing and amount of any shares repurchased will be determined by the Company based on its evaluation of market conditions and other factors, and will be made in accordance with applicable securities laws in either the open market or in privately negotiated transactions. The Company is not obligated to purchase any shares under the program, and the program may be suspended or discontinued at any time. The actual timing, number, and share price of shares repurchased will depend on a number of factors, including the market price of the Company’s common stock, general market and economic conditions, and applicable legal requirements. Any shares repurchased will be held as treasury stock. During the three months ended March 31, 2022, the Company repurchased 313,395 shares of common stock for a total of $6.8 million. The Company did not repurchase any shares of its common stock during the three months ended March 31, 2021. Non-cash Investing Activities - Purchases of property, plant, and equipment included in accounts payable at March 31, 2022 and 2021 were $3.2 million and $2.5 million, respectively. These non-cash amounts are not reflected as Capital expenditures within Investing Activities on the Consolidated Statements of Cash Flows for the respective periods.

Recent Accounting Standards New

Recent Accounting Standards New Accounting Pronouncements, Policy (Policies)	3 Months Ended
	Mar. 31, 2022
Accounting Policies [Abstract]
New Accounting Pronouncements, Policy [Policy Text Block]	Recently Adopted Accounting Standards In August 2020, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2020-06 to simplify the accounting for certain financial instruments with characteristics of liabilities and equity. The standard eliminates certain accounting models that separated embedded conversion features from host contracts for convertible instruments, requiring bifurcation only if the convertible feature qualifies as a derivative under Accounting Standards Codification ("ASC") 815 or for convertible instruments issued at a substantial premium. In addition, the guidance requires the if-converted method of calculating diluted earnings per share for convertible instruments, which eliminates the use of the treasury stock method for instruments that may be settled in cash or shares. The standard can be adopted on a modified retrospective basis to transactions outstanding as of the adoption date or on a fully retrospective basis to all periods presented. The Company adopted the standard using the modified retrospective method on January 1, 2022. Adoption of the standard did not impact the Consolidated Financial Statements as all of the Company’s convertible instruments were settled prior to the adoption date. See Note 8. Borrowings for detail on the Company's convertible instruments that matured on November 1, 2021.

Business Combinations (Tables)

Business Combinations (Tables)	3 Months Ended
	Mar. 31, 2022
Business Combinations [Abstract]
Schedule of the Final Allocation of the Purchase Price to Net Assets	The table below represents the final allocation of the purchase price to net assets acquired as of May 3, 2021: (in millions) Cash $ 2.2 Receivables 3.0 Inventories 2.6 Property, plant, and equipment 8.3 Customer relationships 27.7 Developed technology 5.2 Trademarks and other amortized intangible assets 1.6 Goodwill 32.0 Assumed current liabilities (1.2) Total purchase price $ 81.4

Inventories (Tables)

Inventories (Tables)	3 Months Ended
	Mar. 31, 2022
Inventory, Net [Abstract]
Components of Inventory	The following table details the major components of inventories, net: (in millions) March 31, 2022 December 31, 2021 Raw materials $ 110.6 $ 89.6 Work in progress 35.5 33.6 Finished goods 68.9 66.7 Subtotal 215.0 189.9 Less reserves (38.0) (36.8) Total $ 177.0 $ 153.1

Property, Plant, and Equipmen_2

Property, Plant, and Equipment, net (Tables)	3 Months Ended
	Mar. 31, 2022
Property, Plant and Equipment [Abstract]
Components of property, plant and equipment, net	The following table details the major components of property, plant, and equipment, net: (in millions) March 31, 2022 December 31, 2021 Land $ 12.8 $ 12.9 Buildings and improvements 119.2 119.3 Machinery, equipment, and other 575.3 575.0 Subtotal 707.3 707.2 Less accumulated depreciation (515.6) (506.4) Total $ 191.7 $ 200.8

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets	The gross carrying value and accumulated amortization for each major class of intangible assets are as follows: March 31, 2022 December 31, 2021 (in millions) Gross Carrying Accumulated Gross Carrying Accumulated Amortized intangible assets: Trademarks $ 2.0 $ 0.7 $ 2.0 $ 0.6 Customer relationships 36.4 7.0 36.4 5.9 Developed technology 45.4 14.9 45.4 13.2 Other 2.4 1.4 2.4 1.2 Total 86.2 24.0 86.2 20.9 Unamortized intangible assets: Trademarks 32.0 32.0 Total intangible assets, net $ 94.2 $ 97.3
Schedule of Future Amortization Expense	Amortization expense for the next five years, based on current definite-lived intangible balances, is estimated to be as follows: (in millions) Q2-Q4 2022 $ 9.1 2023 11.6 2024 11.6 2025 11.2 2026 5.3

Restructuring and Related Activ

Restructuring and Related Activities (Tables)	3 Months Ended
	Mar. 31, 2022
Restructuring and Related Activities [Abstract]
Schedule of Restructuring and Related Costs	The following table details restructuring charges incurred by reportable segment for the periods presented: Three Months Ended March 31, (in millions) 2022 2021 Audio $ 6.6 $ 0.2 Precision Devices — — Corporate — — Total $ 6.6 $ 0.2
Schedule of Restructuring Reserve by Type of Cost	The following table details the Company’s severance and other restructuring accrual activity: (in millions) Severance Pay and Benefits Contract Termination and Other Costs Total Balance at December 31, 2021 $ 0.4 $ — $ 0.4 Restructuring charges 2.4 4.2 6.6 Payments (1.2) — (1.2) Balance at March 31, 2022 $ 1.6 $ 4.2 $ 5.8
Schedule of Restructuring Reserve by Balance Sheet Location	The severance and restructuring accruals are recorded in the following line item on the Consolidated Balance Sheets: (in millions) March 31, 2022 December 31, 2021 Other accrued expenses $ 5.8 $ 0.4 Total $ 5.8 $ 0.4

Borrowings (Tables)

Borrowings (Tables)	3 Months Ended
	Mar. 31, 2022
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments	Revolving credit facility borrowings consist of the following: (in millions) March 31, 2022 December 31, 2021 Revolving credit facility $ 70.0 $ 70.0 Less current maturities (1) — — Total long-term debt $ 70.0 $ 70.0
Schedule of Convertible Debt Interest Expense	The following table sets forth total interest expense recognized related to the Notes: Three Months Ended (in millions) March 31, 2021 3.25% coupon $ 1.4 Amortization of debt issuance costs 0.3 Amortization of debt discount 1.9 Total $ 3.6

Other Comprehensive Loss (Table

Other Comprehensive Loss (Tables)	3 Months Ended
	Mar. 31, 2022
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Components of other comprehensive (loss) earnings	The amounts recognized in other comprehensive loss were as follows: Three Months Ended Three Months Ended March 31, 2022 March 31, 2021 (in millions) Pre-tax Tax Net of tax Pre-tax Tax Net of tax Foreign currency translation $ (2.2) $ — $ (2.2) $ (3.6) $ — $ (3.6) Employee benefit plans 0.2 (0.1) 0.1 0.2 — 0.2 Changes in fair value of cash flow hedges (0.3) — (0.3) (1.9) 0.1 (1.8) Total other comprehensive loss $ (2.3) $ (0.1) $ (2.4) $ (5.3) $ 0.1 $ (5.2)
Schedule of (Loss) Earnings	The following tables summarize the changes in balances of each component of accumulated other comprehensive loss, net of tax during the three months ended March 31, 2022 and 2021: (in millions) Cash flow hedges Employee benefit plans Cumulative foreign currency translation adjustments Total Balance at December 31, 2021 $ 0.3 $ (17.1) $ (83.6) $ (100.4) Other comprehensive (loss) earnings, net of tax (0.3) 0.1 (2.2) (2.4) Balance at March 31, 2022 $ — $ (17.0) $ (85.8) $ (102.8) (in millions) Cash flow hedges Employee benefit plans Cumulative foreign currency translation adjustments Total Balance at December 31, 2020 $ 1.6 $ (22.1) $ (80.0) $ (100.5) Other comprehensive (loss) earnings, net of tax (1.8) 0.2 (3.6) (5.2) Balance at March 31, 2021 $ (0.2) $ (21.9) $ (83.6) $ (105.7) The following table summarizes the amounts reclassified from accumulated other comprehensive loss to earnings: Three Months Ended March 31, (in millions) Statement of Earnings Line 2022 2021 Pension and post-retirement benefit plans: Amortization or settlement of actuarial losses and prior service costs Other income, net $ 0.2 $ 0.2 Tax Provision for income taxes (0.1) — Net of tax $ 0.1 $ 0.2 Cash flow hedges: Net gains reclassified into earnings Cost of goods sold $ (0.3) $ (1.3) Tax Provision for income taxes — 0.3 Net of tax $ (0.3) $ (1.0)

Equity Incentive Program (Table

Equity Incentive Program (Tables)	3 Months Ended
	Mar. 31, 2022
Share-based Payment Arrangement, Noncash Expense [Abstract]
Schedule of Black-Scholes Option-Pricing Assumptions	The expense related to stock options granted in the three months ended March 31, 2022 and 2021 was estimated on the date of grant using a Black-Scholes option-pricing model based on the assumptions shown in the table below: Three Months Ended March 31, 2022 2021 Risk-free interest rate 0.85% 0.06% Dividend yield —% —% Expected life (years) 4.5 4.5 Volatility 34.3% 36.0% Fair value at date of grant $6.29 $6.14
Schedule of SSAR and Stock Options Activity	The following table summarizes the Company's stock-settled stock appreciation right ("SSAR") and stock option activity for the three months ended March 31, 2022: SSARs Stock Options Number of Shares Weighted-Average Exercise Price Aggregate Intrinsic Value Weighted-Average Remaining Contractual Term (Years) Number of Shares Weighted-Average Exercise Price Aggregate Intrinsic Value Weighted-Average Remaining Contractual Term (Years) (in millions, except share and per share amounts) Outstanding at December 31, 2021 375,964 $ 23.16 3,478,438 $ 15.04 Granted — — 216,813 21.14 Exercised (36,759) 21.77 (332,336) 12.62 Forfeited — — (6,244) 20.60 Expired (95,573) 21.77 — — Outstanding at March 31, 2022 243,632 $ 23.92 $ — 0.9 3,356,671 $ 15.67 $ 19.7 3.3 Exercisable at March 31, 2022 243,632 $ 23.92 $ — 0.9 2,773,567 $ 14.91 $ 18.4 2.7
Schedule of Restricted Stock Units Award Activity	The following table summarizes the Company's restricted stock unit ("RSU") activity for the three months ended March 31, 2022: Share units Weighted-average grant date fair value Unvested at December 31, 2021 1,778,639 $ 18.89 Granted 997,294 21.14 Vested (1) (722,073) 17.98 Forfeited (65,911) 19.50 Unvested at March 31, 2022 1,987,949 $ 20.28 (1) The number of RSUs vested includes shares that the Company withheld on behalf of employees to satisfy statutory tax withholding requirements.
Share-based Payment Arrangement, Performance Shares, Outstanding Activity	The following table summarizes the Company's PSU activity for the three months ended March 31, 2022: Share units Weighted-average grant date fair value Unvested at December 31, 2021 766,466 $ 21.28 Granted 294,935 29.92 Vested (1) (227,812) 18.44 Forfeited — — Unvested at March 31, 2022 833,589 $ 25.12 (1) The number of PSUs vested includes shares that the Company withheld on behalf of employees to satisfy statutory tax withholding requirements.

Earnings per Share (Tables)

Earnings per Share (Tables)	3 Months Ended
	Mar. 31, 2022
Earnings Per Share [Abstract]
Reconciliation of information used in computing basic and diluted earnings per share	Basic and diluted earnings per share were computed as follows: Three Months Ended March 31, (in millions, except per share amounts) 2022 2021 Net earnings $ 18.1 $ 12.5 Basic: Net earnings per share $ 0.20 $ 0.14 Weighted-average shares outstanding 92.3 92.3 Diluted: Net earnings per share $ 0.19 $ 0.13 Weighted-average shares outstanding 94.3 95.0

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2022
Segment Reporting [Abstract]
Revenue and Earnings from continuing operations by market segment	Three Months Ended March 31, (in millions) 2022 2021 Revenues: Audio $ 145.7 $ 163.1 Precision Devices 55.7 37.9 Total revenues $ 201.4 $ 201.0 Earnings before interest and income taxes: Audio $ 22.2 $ 30.4 Precision Devices 12.3 4.5 Total segments 34.5 34.9 Corporate expense / other 12.7 15.7 Interest expense, net 0.8 4.0 Earnings before income taxes 21.0 15.2 Provision for income taxes 2.9 2.7 Net earnings $ 18.1 $ 12.5
Reconciliation of Assets from Segment to Consolidated	Information regarding assets of the Company's reportable segments: Total Assets (in millions) March 31, 2022 December 31, 2021 Audio $ 1,440.8 $ 1,467.1 Precision Devices 274.5 260.4 Corporate / eliminations 3.4 4.1 Total $ 1,718.7 $ 1,731.6
Revenue from External Customers by Geographic Areas	The following table details revenues by geographic location. Revenues are attributed to regions based on the location of the Company's direct customer, which in some instances is an intermediary and not necessarily the end user. The Company's businesses are based primarily in Asia, North America, and Europe. Three Months Ended March 31, (in millions) 2022 2021 Asia $ 128.9 $ 148.1 United States 40.9 31.5 Europe 28.1 19.2 Other Americas 1.5 1.2 Other 2.0 1.0 Total $ 201.4 $ 201.0

Basis of Presentation (Details)

Basis of Presentation (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Feb. 24, 2020
Noncash Investing and Financing Items
Purchases of property and equipment included in accounts payable	$ 3.2	$ 2.5
Stock Repurchase Program, Authorized Amount			$ 100
Payments for Repurchase of Common Stock	$ 6.8	$ 0

Business Combinations (Details)

Business Combinations (Details) - USD ($) $ in Millions	Dec. 20, 2019	Mar. 31, 2022	Sep. 30, 2021	Dec. 31, 2021	May 03, 2021
Finite-Lived Intangible Assets
Goodwill		$ 942		$ 941.3
Goodwill, Purchase Accounting Adjustments		$ 0.7
Integrated Microwave Corporation
Business Combination Segment Allocation [Line Items]
Payments to Acquire Businesses, Gross	$ 81.4
Finite-Lived Intangible Assets
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents					$ 2.2
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables					3
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory					2.6
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment					8.3
Goodwill					32
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities					(1.2)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net					81.4
Integrated Microwave Corporation | Unpatented Technology [Member]
Finite-Lived Intangible Assets
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles					5.2
Finite-Lived Intangible Asset, Useful Life			10 years
Finite-Lived Intangible Asset, Useful Life			10 years
Integrated Microwave Corporation | Trademarks
Finite-Lived Intangible Assets
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles					1.6
Integrated Microwave Corporation | Customer relationships
Finite-Lived Intangible Assets
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles					$ 27.7
Finite-Lived Intangible Asset, Useful Life			8 years
Finite-Lived Intangible Asset, Useful Life			8 years

Inventories (Details)

Inventories (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Inventory, Net [Abstract]
Raw materials	$ 110.6	$ 89.6
Work in progress	35.5	33.6
Finished goods	68.9	66.7
Subtotal	215	189.9
Less reserves	(38)	(36.8)
Total	$ 177	$ 153.1

Property, Plant and Equipment,

Property, Plant and Equipment, net (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Property, Plant and Equipment
Cost	$ 707.3		$ 707.2
Less accumulated depreciation	(515.6)		(506.4)
Total	191.7		200.8
Depreciation	11.7	$ 11.8
Restructuring charges	6.6	0.2
Severance Pay and Contract Termination and Other Costs
Property, Plant and Equipment
Restructuring charges	6.6	0.2
Severance Pay and Contract Termination and Other Costs | Operating Segments | Corporate, Non-Segment [Member]
Property, Plant and Equipment
Restructuring charges	0	$ 0
Land
Property, Plant and Equipment
Cost	12.8		12.9
Buildings and improvements
Property, Plant and Equipment
Cost	119.2		119.3
Machinery, equipment, and other
Property, Plant and Equipment
Cost	$ 575.3		$ 575

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets - Goodwill (Details) $ in Millions	3 Months Ended
	Mar. 31, 2022USD ($)
Goodwill [Roll Forward]
Balance at December 31, 2021	$ 941.3
44651	942
Goodwill, Purchase Accounting Adjustments	0.7
Audio
Goodwill [Roll Forward]
Balance at December 31, 2021	878.8
44651	878.8
Goodwill, Purchase Accounting Adjustments	0
Precision Devices
Goodwill [Roll Forward]
Balance at December 31, 2021	62.5
44651	63.2
Precision Devices | Integrated Microwave Corporation
Goodwill [Roll Forward]
Goodwill, Purchase Accounting Adjustments	$ 0.7

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets - Intangible Assets and Amortization Expense (Details) - USD ($) $ in Millions	3 Months Ended		5 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Sep. 30, 2021	Dec. 31, 2021
Finite-Lived Intangible Assets
Gross carrying amount	$ 86.2			$ 86.2
Accumulated amortization	24			20.9
Intangible assets, net	94.2			97.3
Amortization expense	3.1	$ 3.3
2021	9.1
2022	11.6
2023	11.6
2024	11.2
2025	5.3
Trademarks
Finite-Lived Intangible Assets
Unamortized intangible assets, gross carrying amount	32			32
Trademarks
Finite-Lived Intangible Assets
Gross carrying amount	2			2
Accumulated amortization	0.7			0.6
Customer relationships
Finite-Lived Intangible Assets
Gross carrying amount	36.4			36.4
Accumulated amortization	7			5.9
Customer relationships | Integrated Microwave Corporation
Finite-Lived Intangible Assets
Finite-Lived Intangible Asset, Useful Life			8 years
Unpatented Technology [Member]
Finite-Lived Intangible Assets
Gross carrying amount	45.4			45.4
Accumulated amortization	14.9			13.2
Unpatented Technology [Member] | Integrated Microwave Corporation
Finite-Lived Intangible Assets
Finite-Lived Intangible Asset, Useful Life			10 years
Other
Finite-Lived Intangible Assets
Gross carrying amount	2.4			2.4
Accumulated amortization	$ 1.4			$ 1.2

Restructuring and Related Act_2

Restructuring and Related Activities - Restructuring Charges by Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Restructuring Cost and Reserve
Restructuring charges	$ 6.6	$ 0.2
Restructuring and Related Cost, Incurred Cost	6.6
MEMS Microphones product line
Restructuring Cost and Reserve
Restructuring charges	5.4
Severance Pay and Contract Termination and Other Costs
Restructuring Cost and Reserve
Restructuring charges	6.6	0.2
Severance Pay and Benefits
Restructuring Cost and Reserve
Restructuring and Related Cost, Incurred Cost	2.4
Contract Termination and Other Costs
Restructuring Cost and Reserve
Restructuring and Related Cost, Incurred Cost	4.2
Operating Segments | Audio | Severance Pay and Contract Termination and Other Costs
Restructuring Cost and Reserve
Restructuring charges	6.6	0.2
Operating Segments | Precision Devices | Severance Pay and Contract Termination and Other Costs
Restructuring Cost and Reserve
Restructuring charges	0	0
Operating Segments | Corporate, Non-Segment [Member] | Severance Pay and Contract Termination and Other Costs
Restructuring Cost and Reserve
Restructuring charges	0	0
Cost of Goods Sold, Restructuring Charges | Severance Pay and Contract Termination and Other Costs
Restructuring Cost and Reserve
Restructuring charges	0	0
Operating Expense | Severance Pay and Contract Termination and Other Costs
Restructuring Cost and Reserve
Restructuring charges	6.6	$ 0.2
Restructuring Charges | Severance Pay and Benefits | Intelligent Audio [Member]
Restructuring Cost and Reserve
Restructuring charges	1.2
Restructuring Charges | Severance Pay and Benefits | MEMS Microphones product line
Restructuring Cost and Reserve
Restructuring charges	1.2
Restructuring Charges | Contract Termination [Member] | MEMS Microphones product line
Restructuring Cost and Reserve
Restructuring charges	4.2
Contract Termination [Member] | MEMS Microphones product line | Maximum [Member]
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost Remaining	$ 4

Restructuring and Related Act_3

Restructuring and Related Activities - Restructuring Accrual Activities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Restructuring Cost and Reserve
Restructuring charges	$ 6.6	$ 0.2
Restructuring Reserve [Roll Forward]
Severance and other restructuring reserve, beginning balance	0.4
Restructuring charges	6.6
Payments	(1.2)
Severance and other restructuring reserve, ending balance	5.8
Severance Pay and Contract Termination and Other Costs
Restructuring Cost and Reserve
Restructuring charges	6.6	0.2
Severance Pay and Benefits
Restructuring Reserve [Roll Forward]
Severance and other restructuring reserve, beginning balance	0.4
Restructuring charges	2.4
Payments	(1.2)
Severance and other restructuring reserve, ending balance	1.6
Contract Termination and Other Costs
Restructuring Reserve [Roll Forward]
Severance and other restructuring reserve, beginning balance	0
Restructuring charges	4.2
Payments	0
Severance and other restructuring reserve, ending balance	4.2
Cost of Goods Sold, Restructuring Charges | Severance Pay and Contract Termination and Other Costs
Restructuring Cost and Reserve
Restructuring charges	0	0
Operating Expense | Severance Pay and Contract Termination and Other Costs
Restructuring Cost and Reserve
Restructuring charges	$ 6.6	$ 0.2

Restructuring and Related Act_4

Restructuring and Related Activities - Balance Sheet Location (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Restructuring Cost and Reserve
Severance and restructuring accrual	$ 5.8	$ 0.4
Other accrued expenses
Restructuring Cost and Reserve
Severance and restructuring accrual	$ 5.8	$ 0.4

Hedging Transaction and Derivat

Hedging Transaction and Derivative Instruments - Gain (Loss) of Derivative Instruments Recognized on Income Statement (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Derivative
Cost of goods sold	$ 118.1	$ 123
Interest expense, net	(0.8)	(4)
Other expense (income), net	$ 0.5	$ 0.9

Borrowings (Details)

Borrowings (Details) - USD ($) $ / shares in Units, $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Long-term borrowings
Long-term Line of Credit	$ 70
Less: current maturities	70	$ 70
Long-term portion	70	$ 70
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year	0
Long-term Debt, Maturities, Repayments of Principal in Year Two	0
Long-term Debt, Maturities, Repayments of Principal in Year Three	70
Long-term Debt, Maturities, Repayments of Principal in Year Four	0
Long-term Debt, Maturities, Repayments of Principal in Year Five	0
Debt Instrument, Convertible, Conversion Price		$ 18.4250
Line of Credit | Credit Facility due January 2, 2024 [Member]
Long-term borrowings
Long-term Line of Credit	70	$ 70
Line of Credit, Current	$ 0	$ 0

Borrowings Convertible Debt (De

Borrowings Convertible Debt (Details) $ / shares in Units, $ in Millions	3 Months Ended			12 Months Ended
	Mar. 31, 2022USD ($)shares	Mar. 31, 2021USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2021$ / sharesshares	May 04, 2016USD ($)$ / shares
Schedule of Convertible Debt
Debt Instrument, Convertible, Conversion Ratio				54.2741
Debt Instrument, Convertible, Conversion Price | $ / shares				$ 18.4250
Shares Issued During Period, Value, Exercise of Warrants	$ 0
Treasury Stock
Schedule of Convertible Debt
Stock Issued During Period, Shares, Conversion of Convertible Securities | shares				400,000
Shares Issued During Period, Shares, Exercise of Warrants | shares	203,615
Shares Issued During Period, Value, Exercise of Warrants	$ (3.1)
Convertible Debt | Convertible Notes Due Twenty Twenty One
Schedule of Convertible Debt
Debt Instrument, Interest Rate, Stated Percentage					3.25%
Debt Instrument, Face Amount					$ 172.5
Interest Expense, Debt, Excluding Amortization		$ 1.4
Amortization of Debt Issuance Costs		0.3
Amortization of Debt Discount (Premium)		1.9
Interest Expense, Debt		$ 3.6
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares					$ 21.1050
Proceeds from issuance of warrants			$ 39.1

Borrowings Schedule of Revolvin

Borrowings Schedule of Revolving Credit Facility (Details)	3 Months Ended
	Mar. 31, 2022USD ($)	Mar. 31, 2021	Dec. 31, 2021USD ($)	Sep. 04, 2020USD ($)
Schedule of Term Loan and Revolving Credit Facilities [Line Items]
Long-term Line of Credit	$ 70,000,000
Debt Instrument, Covenant, EBITDA to Interest Ratio, Minimum	3.25
Debt Instrument, Covenant, Debt to EBITDA, Maximum	3.75
Debt Instrument, Covenant, Senior Secured Leverage Ratio, Maximum	3.25
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year	$ 0
Long-term Debt, Maturities, Repayments of Principal in Year Two	0
Long-term Debt, Maturities, Repayments of Principal in Year Four	0
Long-term Debt, Maturities, Repayments of Principal in Year Five	0
Shares Issued During Period, Value, Exercise of Warrants	$ 0
Line of Credit | Weighted Average
Schedule of Term Loan and Revolving Credit Facilities [Line Items]
Line of Credit Facility, Commitment Fee Percentage	0.24%	0.27%
Credit Facilities | London Interbank Offered Rate (LIBOR)
Schedule of Term Loan and Revolving Credit Facilities [Line Items]
Long-term Debt, Weighted Average Interest Rate, at Point in Time	2.12%	0.00%
Credit Facility due January 2, 2024 [Member]
Schedule of Term Loan and Revolving Credit Facilities [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 400,000,000
Credit Facility due January 2, 2024 [Member] | Minimum [Member]
Schedule of Term Loan and Revolving Credit Facilities [Line Items]
Line of Credit Facility, Commitment Fee Percentage	0.225%
Credit Facility due January 2, 2024 [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR)
Schedule of Term Loan and Revolving Credit Facilities [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.50%
Credit Facility due January 2, 2024 [Member] | Minimum [Member] | Applicable margin alternate base rate [Member]
Schedule of Term Loan and Revolving Credit Facilities [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.50%
Credit Facility due January 2, 2024 [Member] | Maximum [Member]
Schedule of Term Loan and Revolving Credit Facilities [Line Items]
Line of Credit Facility, Commitment Fee Percentage	0.375%
Credit Facility due January 2, 2024 [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR)
Schedule of Term Loan and Revolving Credit Facilities [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.50%
Credit Facility due January 2, 2024 [Member] | Maximum [Member] | Applicable margin alternate base rate [Member]
Schedule of Term Loan and Revolving Credit Facilities [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.50%
Credit Facility due January 2, 2024 [Member] | Line of Credit
Schedule of Term Loan and Revolving Credit Facilities [Line Items]
Long-term Line of Credit	$ 70,000,000		$ 70,000,000
Credit Facility due October 11, 2022
Schedule of Term Loan and Revolving Credit Facilities [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity				$ 400,000,000

Other Comprehensive Loss - OCI

Other Comprehensive Loss - OCI (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Foreign currency translation adjustments [Abstract]
Foreign currency translation	$ (2.2)	$ (3.6)
Foreign currency translation, tax	0	0
Foreign currency translation, net of tax	(2.2)	(3.6)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax, Attributable to Parent [Abstract]
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent	0.2	0.2
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax, Attributable to Parent	(0.1)	0
Net change in employee benefit plans	0.1	0.2
Total cash flow hedges	(0.3)	(1.8)
Changes in fair value of cash flow hedges:
Changes in fair value of cash flow hedges, before tax	(0.3)	(1.9)
Changes in fair value of cash flow hedges, tax	0	0.1
Total other comprehensive earnings [Abstract]
Other comprehensive loss, before tax	(2.3)	(5.3)
Other comprehensive loss, tax	(0.1)	0.1
Other comprehensive loss, net of tax	(2.4)	(5.2)
Net gains reclassified into earnings	$ (0.3)	$ (1)

Other Comprehensive Loss - AOCI

Other Comprehensive Loss - AOCI (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Amortization or settlement of actuarial losses and prior service costs	$ 0.2	$ 0.2
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax	0.1	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax	0.1	0.2
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	(0.3)	(1.3)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	0	0.3
Net gains reclassified into earnings	(0.3)	(1)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	(100.4)	(100.5)
Other comprehensive (loss) earnings, net of tax	(2.4)	(5.2)
Ending balance	(102.8)	(105.7)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	0.3	1.6
Other comprehensive (loss) earnings, net of tax	(0.3)	(1.8)
Ending balance	0	(0.2)
Employee benefit plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	(17.1)	(22.1)
Other comprehensive (loss) earnings, net of tax	0.1	0.2
Ending balance	(17)	(21.9)
Cumulative foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	(83.6)	(80)
Other comprehensive (loss) earnings, net of tax	(2.2)	(3.6)
Ending balance	$ (85.8)	$ (83.6)

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Tax Holiday [Line Items]
Share-based Payment Arrangement, Expense	$ 7.6	$ 11.1
Effective tax rate (benefit) provision	13.80%	17.80%
Income Tax Expense (Benefit)	$ 2.9	$ 2.7
Other expense (income), net	0.5	0.9
Effective Income Tax Rate Reconciliation, Discrete Items	$ (1)	$ (0.1)
Effective Tax Rate Excluding Discrete Items	(18.60%)	(18.40%)
Foreign Tax Authority
Income Tax Holiday [Line Items]
Effective income tax rate reconciliation, tax holiday	$ 2.6	$ 2.4
Holiday benefit (usd per share)	$ 0.03	$ 0.03

Equity Incentive Program - Stoc

Equity Incentive Program - Stock Options and SSARs (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Payment Arrangement, Expense	$ 7,600,000	$ 11,100,000
SSARs
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 0
Number of Shares [Roll Forward]
Beginning balance	375,964
Granted	0
Exercised	(36,759)
Forfeited	0
Expired	(95,573)
Ending balance	243,632
Exercised	243,632
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instrument Other than Options, Expired in Period, Weighted Average Exercise Price	$ 21.77
Weighted Average Grant Date Fair Value
Beginning balance	23.16
Granted	0
Exercised	21.77
Forfeited	0
Ending balance	23.92
Exercisable	$ 23.92
SARS and Options, Additional Disclosures
SSARs, aggregate intrinsic value, outstanding	$ 0
SSARs, aggregate intrinsic value, exercisable	$ 0
SSARs, weighted average remaining contractual terms, outstanding	10 months 24 days
SSARs, weighted average remaining contractual term, exercisable	10 months 24 days
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 2,900,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Risk-free interest rate	0.85%
Dividend yield	0.00%	0.00%
Expected life (years)	4 years 6 months
Volatility	34.30%
Stock Options, Number of Shares
Beginning balance	3,478,438
Granted	216,813
Exercised	(332,336)
Forfeited	(6,244)
Expired	0
Ending balance	3,356,671
Exercisable	2,773,567
Stock Options, Weighted Average Exercise Price
Beginning balance	$ 15.04
Granted	21.14
Exercised	12.62
Forfeited	20.60
Expired	0
Ending balance	15.67
Exercisable	$ 14.91
SARS and Options, Additional Disclosures
Options, aggregate intrinsic value, outstanding	$ 19,700,000
Options, aggregate intrinsic value, exercisable	$ 18,400,000
Options, weighted average remaining contractual term, outstanding	3 years 3 months 18 days
Options, weighted average remaining contractual term, exercisable	2 years 8 months 12 days
Minimum [Member] | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Risk-free interest rate		0.06%
Expected life (years)		4 years 6 months
Volatility		36.00%
Fair value at date of grant	$ 6.29	$ 6.14

Equity Incentive Program - RSUs

Equity Incentive Program - RSUs (Details) - Restricted Stock Units (RSUs)	3 Months Ended
	Mar. 31, 2022$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	2 years 2 months 12 days
Number of Shares [Roll Forward]
Beginning balance | shares	1,778,639
Granted | shares	997,294
Vested (1) | shares	(722,073)
Forfeited | shares	(65,911)
Ending balance | shares	1,987,949
Weighted Average Grant Date Fair Value
Beginning balance | $ / shares	$ 18.89
Granted | $ / shares	21.14
Vested (1) | $ / shares	17.98
Forfeited | $ / shares	19.50
Ending balance | $ / shares	$ 20.28

Equity Incentive Program Equity

Equity Incentive Program Equity Incentive Program - PSUs (Details) - Performance Shares $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2022USD ($)$ / sharesshares	Mar. 31, 2021numberOfGrantees	Mar. 31, 2020numberOfGrantees	Mar. 31, 2019numberOfGrantees
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $	$ 16.5
Number of Shares [Roll Forward]
Beginning balance | shares	766,466
Granted | shares	294,935
Vested (1) | shares	(227,812)
Forfeited | shares	0
Ending balance | shares	833,589
Weighted Average Grant Date Fair Value
Beginning balance | $ / shares	$ 21.28
Granted | $ / shares	29.92
Vested (1) | $ / shares	18.44
Forfeited | $ / shares	0
Ending balance | $ / shares	$ 25.12
Share-based Payment Arrangement, Plan Modification, Number of Grantees Affected | numberOfGrantees		8	8	9
2019
Weighted Average Grant Date Fair Value
Share-based Payment Arrangement, Plan Modification, Incremental Cost | $	$ 2.4
2018
Weighted Average Grant Date Fair Value
Share-based Payment Arrangement, Plan Modification, Incremental Cost | $	3.9
2020
Weighted Average Grant Date Fair Value
Share-based Payment Arrangement, Plan Modification, Incremental Cost | $	$ 4.7

Equity Incentive Program - Addi

Equity Incentive Program - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Payment Arrangement, Expense	$ 7,600,000	$ 11,100,000
Share-based Payment Arrangement, Expense, Tax Benefit	3,200,000	$ 0
SSARs
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	0
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 2,900,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	1 year 9 months 18 days
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 32,600,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	2 years 2 months 12 days
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 16,500,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	1 year 10 months 24 days
Minimum [Member] | Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award
Percentage increase of initial grant value	0.00%
Maximum [Member] | Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award
Percentage increase of initial grant value	225.00%

Earnings per Share (Details)

Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Reconciliation of information used in computing basic and diluted earnings per share [Abstract]
Earnings (loss) from continuing operations	$ 18.1	$ 12.5
Net earnings	$ 18.1	$ 12.5
Basic:
Net earnings (loss) per share, basic	$ 0.20	$ 0.14
Weighted average shares outstanding	92,300,000	92,300,000
Diluted:
Net earnings (loss) per share, diluted	$ 0.19	$ 0.13
Diluted (in shares)	94,300,000	95,000,000
Weighted average number of anti-dilutive shares excluded from the calculation (in shares)	500,000	1,800,000

Segment Information (Details)

Segment Information (Details) $ in Millions	3 Months Ended
	Mar. 31, 2022USD ($)segments	Mar. 31, 2021USD ($)	Dec. 31, 2021USD ($)
Segment Reporting Information
Billed Contracts Receivable	$ 128.6		$ 137.7
Number of reportable segments | segments	2
Assets	$ 1,718.7		1,731.6
Revenues	201.4	$ 201
Reconciliation of Net Earnings from Segments [Abstract]
Interest expense, net	0.8	4
Earnings before income taxes	21	15.2
Provision for income taxes	2.9	2.7
Earnings (loss) from continuing operations	18.1	12.5
Asia
Segment Reporting Information
Revenues	128.9	148.1
United States
Segment Reporting Information
Revenues	40.9	31.5
Europe
Segment Reporting Information
Revenues	28.1	19.2
Other Americas
Segment Reporting Information
Revenues	1.5	1.2
Other Geographical Locations
Segment Reporting Information
Revenues	2	1
Operating Segments
Reconciliation of Net Earnings from Segments [Abstract]
Earnings (loss) before interest and income taxes	34.5	34.9
Operating Segments | Audio
Segment Reporting Information
Assets	1,440.8		1,467.1
Revenues	145.7	163.1
Reconciliation of Net Earnings from Segments [Abstract]
Earnings (loss) before interest and income taxes	22.2	30.4
Operating Segments | Precision Devices
Segment Reporting Information
Assets	274.5		260.4
Revenues	55.7	37.9
Reconciliation of Net Earnings from Segments [Abstract]
Earnings (loss) before interest and income taxes	12.3	4.5
Corporate, Non-Segment [Member]
Segment Reporting Information
Assets	3.4		$ 4.1
Reconciliation of Net Earnings from Segments [Abstract]
Corporate expense / other	12.7	15.7
Interest expense, net	$ 0.8	$ 4

Subsequent Events (Details)

Subsequent Events (Details) $ in Millions	Apr. 28, 2022USD ($)
Subsequent Event
Subsequent Event [Line Items]
Share Repurchase Program, Authorized Amount, Increase (Decrease)	$ 150

Uncategorized Items - kn-202203

Label	Element	Value
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations	us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	$ 68,900,000
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations	us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	$ 147,800,000