Knowles (KN) 10-Q 28 Oct 21 2021 Q3 Quarterly report Financial data

Cover

Cover - shares	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Oct. 26, 2021
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			92,345,471
Document Type		10-Q
Entity Central Index Key		0001587523
Current Fiscal Year End Date		--12-31
Document Period End Date	Sep. 30, 2021
Document Fiscal Period Focus		Q3
Amendment Flag		false
Document Fiscal Year Focus		2021

CONSOLIDATED STATEMENTS OF EARN

CONSOLIDATED STATEMENTS OF EARNINGS (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Revenues	$ 233	$ 205.8	$ 633.8	$ 521.1
Cost of goods sold	136.1	130.6	375.2	339.6
Restructuring charges - cost of goods sold	0	0	0	2.3
Gross profit	96.9	75.2	258.6	179.2
Research and development expenses	22.3	21.9	70.2	70.2
Selling and administrative expenses	36	32	108.9	99.3
Asset Impairment Charges	4	7.6	4	7.6
Restructuring charges	0	0.1	0.3	10.5
Operating expenses	62.3	61.6	183.4	187.6
Operating earnings (loss)	34.6	13.6	75.2	(8.4)
Interest expense, net	4.2	4.7	12.3	12.5
Other (income) expense, net	(1.9)	1	(3.4)	0.2
Earnings (loss) before income taxes and discontinued operations	32.3	7.9	66.3	(21.1)
Provision for income taxes	4.6	2.3	8.7	5.6
Earnings (loss) from continuing operations	27.7	5.6	57.6	(26.7)
Earnings from discontinued operations, net	0	0	0.2	3.7
Net earnings (loss)	$ 27.7	$ 5.6	$ 57.8	$ (23)
Earnings per share:
Earnings (loss) from continuing operations, per basic share	$ 0.30	$ 0.06	$ 0.62	$ (0.29)
Earnings (loss) from continuing operations, per diluted share	0.29	0.06	0.61	(0.29)
Earnings from discontinued operations, per basic share	0	0	0.01	0.04
Earnings from discontinued operations, per diluted share	0	0	0	0.04
Net earnings (loss) per share, basic	0.30	0.06	0.63	(0.25)
Net earnings (loss) per share, diluted	$ 0.29	$ 0.06	$ 0.61	$ (0.25)
Weighted-average common shares outstanding:
Basic (in shares)	92,189,329	91,688,765	92,315,146	91,707,702
Diluted (in shares)	94,143,034	92,473,318	94,780,940	91,707,702

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net earnings (loss)	$ 27.7	$ 5.6	$ 57.8	$ (23)
Foreign currency translation	(3.7)	9.2	(6.4)	5.1
Employee benefit plans:
Amortization or settlement of actuarial losses and prior service costs	0.1	0.3	0.7	0.5
Net change in employee benefit plans	0.1	0.3	0.7	0.5
Changes in fair value of cash flow hedges:
Unrealized net (losses) gains arising during period	(0.2)	1.4	(0.5)	0.5
Net losses (gains) reclassified into earnings	0.1	(0.5)	(1.4)	(0.1)
Total cash flow hedges	(0.1)	0.9	(1.9)	0.4
Other comprehensive (loss) earnings, net of tax	(3.7)	10.4	(7.6)	6
Comprehensive earnings (loss)	$ 24	$ 16	$ 50.2	$ (17)

CONSOLIDATED BALANCE SHEETS (Un

CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 140	$ 147.8
Accounts Receivable, after Allowance for Credit Loss, Current	129.8	131.4
Inventories, net	155.7	130.1
Prepaid and other current assets	9.9	10.3
Total current assets	435.4	419.6
Property, plant, and equipment, net	190.6	191.5
Goodwill	941.3	910
Intangible assets, net	101.7	78.7
Operating Lease, Right-of-Use Asset	17	23.3
Other assets and deferred charges	(37.2)	(31.8)
Total assets	1,723.2	1,654.9
Current liabilities:
Less: current maturities	171.8	165.1
Accounts payable	72.9	70.3
Accrued compensation and employee benefits	36.8	30.4
Operating Lease, Liability, Current	10.9	10.2
Other accrued expenses	20.7	18.6
Federal and other taxes on income	0.4	2.7
Total current liabilities	313.5	297.3
Long-term debt	0	0
Deferred Income Tax Liabilities, Net	2	2
Operating Lease, Liability, Noncurrent	15.8	18.7
Other liabilities	25.8	32.8
Commitments and contingencies (Note 15)
Stockholders' equity:
Preferred Stock, Value, Issued	0	0
Common Stock, Value, Issued	0.9	0.9
Treasury Stock, Value	(36.2)	(16.2)
Additional paid-in capital	1,620.2	1,587.8
Accumulated deficit	(110.7)	(168.5)
Accumulated other comprehensive loss	(108.1)	(100.5)
Total stockholders' equity	1,366.1	1,303.5
Total liabilities and stockholders' equity	1,723.2	1,654.9
Disposal Group, Including Discontinued Operation, Liabilities	$ 0	$ 0.6
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, Shares, Outstanding	92,325,699	91,611,549
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)	94,415,186	92,689,912
Treasury Stock, Shares	2,089,487	1,078,363
Document Period End Date	Sep. 30, 2021

CONSOLIDATED BALANCE SHEETS (_2

CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Allowance for doubtful accounts receivable	$ 1.4	$ 1.6
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)	94,415,186	92,689,912
Treasury Stock, Shares	2,089,487	1,078,363

CONSOLIDATED STATEMENT OF STOCK

CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (unaudited) - USD ($) $ in Millions	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss	Treasury Stock
Balance at Dec. 31, 2019	$ 1,288.5	$ 0.9	$ 1,574.7	$ (175.1)	$ (112)	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	(23)			(23)
Earnings (loss) from continuing operations	(26.7)
Other comprehensive (loss) earnings, net of tax	6
Other comprehensive loss, net of tax					6
Treasury Stock, Value, Acquired, Cost Method	(15)					(15)
Stock-based compensation expense	12.4		12.4
Common stock issued for exercise of stock options and other	1.8		1.8
Tax on restricted stock unit vesting	(6.1)		(6.1)
Balance at Sep. 30, 2020	1,264.6	0.9	1,582.8	(198.1)	(106)	(15)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	0.1
Balance at Jun. 30, 2020	1,243.8	0.9	1,578	(203.7)	(116.4)	(15)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	5.6			5.6
Earnings (loss) from continuing operations	5.6
Other comprehensive (loss) earnings, net of tax	10.4
Other comprehensive loss, net of tax					10.4
Stock-based compensation expense	4.8		4.8
Common stock issued for exercise of stock options and other	0.1		0.1
Tax on restricted stock unit vesting	(0.1)		(0.1)
Balance at Sep. 30, 2020	1,264.6	0.9	1,582.8	(198.1)	(106)	(15)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	0.1
Treasury Stock, Value	16.2
Balance at Dec. 31, 2020	1,303.5	0.9	1,587.8	(168.5)	(100.5)	(16.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	57.8
Earnings (loss) from continuing operations	57.6			57.6
Other comprehensive (loss) earnings, net of tax	(7.6)
Other comprehensive loss, net of tax					(7.6)
Treasury Stock, Value, Acquired, Cost Method	(20)					(20)
Stock-based compensation expense	25.6		25.6
Common stock issued for exercise of stock options and other	14.4		14.4
Tax on restricted stock unit vesting	(7.6)		(7.6)
Balance at Sep. 30, 2021	1,366.1	0.9	1,620.2	(110.7)	(108.1)	(36.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	(0.3)
Balance at Jun. 30, 2021	1,332.1		1,610.2	(138.4)	(104.4)	(36.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	27.7			27.7
Earnings (loss) from continuing operations	27.7			27.7
Other comprehensive (loss) earnings, net of tax	(3.7)
Other comprehensive loss, net of tax					(3.7)
Stock-based compensation expense	7.1		7.1
Common stock issued for exercise of stock options and other	3.9		3.9
Tax on restricted stock unit vesting	(1)		(1)
Balance at Sep. 30, 2021	1,366.1	$ 0.9	$ 1,620.2	$ (110.7)	$ (108.1)	$ (36.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	(0.1)
Treasury Stock, Value	$ 36.2

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Proceeds from the sale of business	$ 3.5	$ 0
Proceeds from Sale of Short-term Investments	0.4	0
Payments to Acquire Businesses, Net of Cash Acquired	78.5	0
Asset Impairment Charges	4	7.6
Repayments of Lines of Credit	0	(50)
Payments of Debt Issuance Costs	0	(0.9)
Adjustments to reconcile net earnings (loss) to cash from operating activities:
Increase (Decrease) in Other Noncurrent Assets and Liabilities, Net	6.2	(0.3)
Other accrued expenses	2.4	8
Impaired Assets to be Disposed of by Method Other than Sale, Amount of Impairment Loss	0	1.7
Gain (Loss) on Disposition of Property Plant Equipment	(0.2)	0.2
Depreciation and amortization	46.6	45.7
Stock-based compensation	25.6	12.4
Non-cash interest expense and amortization of debt issuance costs	7.1	6.6
Deferred income taxes	(1.5)	(2.6)
Other, net	(2.5)	1.4
Changes in assets and liabilities (excluding effects of foreign exchange):
Increase (Decrease) in Other Noncurrent Assets and Liabilities, Net	6.2	(0.3)
Increase (Decrease) in Prepaid Expense and Other Assets	1.4	1.5
Other accrued expenses	2.4	8
Receivables, net	4.6	34.6
Inventories, net	(24)	(16.3)
Prepaid and other current assets	(1.4)	(1.5)
Accounts payable	1.4	(17.2)
Accrued compensation and employee benefits	5.9	(5.3)
Increase Decrease Accrued Taxes, Net	(3)	0
Net Cash Provided by (Used in) Operating Activities	116.6	52.6
Investing Activities
Net Cash Provided by (Used in) Investing Activities, Total	(109.4)	(20.3)
Additions to property, plant, and equipment	(28.2)	(20.4)
Payments for (Proceeds from) Investments	(3.5)	0
Proceeds from Sale of Property, Plant, and Equipment	0.4	0.1
Financing Activities
Net Cash Provided by (Used in) Financing Activities, Total	(14.9)	28.2
Borrowings under revolving credit facility	0	100
Payments for Repurchase of Common Stock	20	15
Tax on restricted and performance stock unit vesting	(7.6)	(6.1)
Payments of finance lease obligations	(1.7)	(1.4)
Proceeds from exercise of stock-based awards	14.4	1.6
Effect of Exchange Rate on Cash and Cash Equivalents [Abstract]
Effect of exchange rate changes on cash and cash equivalents	(0.1)	0.2
Net earnings (loss)	57.8	(23)
Net (decrease) increase in cash and cash equivalents	(7.8)	60.7
Cash and Cash Equivalents, at Carrying Value, Including Discontinued Operations, Beginning Balance	147.8	78.4
Cash and Cash Equivalents, at Carrying Value, Including Discontinued Operations	140	139.1
Supplemental information - cash paid for:
Income taxes	12.3	9.5
Interest	$ 4	$ 5

Basis of Presentation (Notes)

Basis of Presentation (Notes)	9 Months Ended
	Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Description of Business - Knowles Corporation (NYSE:KN) is a market leader and global provider of advanced micro-acoustic microphones and speakers, audio processing, and precision device solutions, serving the consumer electronics, communications, medtech, defense, electric vehicle, and industrial 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 in mobile, ear, and Internet of Things ("IoT") applications. Knowles is also a leader in acoustic components, high-end capacitors, and radio frequency ("RF") solutions for a diverse set of markets. The Company's focus on the customer, combined with its unique technology, proprietary manufacturing techniques, rigorous testing, and global scale, enable the Company to deliver innovative solutions that optimize the user experience. 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, 2020 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 rapidly evolving. 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. On May 3, 2021, the Company acquired all of the outstanding shares of common stock of Integrated Microwave Corporation ("IMC"), a manufacturer of RF filters. See Note 4. Acquisition for additional information related to the transaction. 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. 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 nine months ended September 30, 2021, the Company repurchased 1,011,124 shares of common stock for a total of $20.0 million. Non-cash Investing Activities - Purchases of property, plant, and equipment included in accounts payable at September 30, 2021 and 2020 were $3.6 million and $1.9 million, respectively. These non-cash amounts are not reflected as outflows to "Additions to property, plant, and equipment" within "Investing Activities" of the Consolidated Statements of Cash Flows for the respective periods.

Recent Accounting Standards (No

Recent Accounting Standards (Notes)	9 Months Ended
	Sep. 30, 2021
Accounting Standards Update and Change in Accounting Principle [Abstract]
Recent Accounting Standards	Recently Issued 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 is effective for public business entities for fiscal years beginning after December 15, 2021, including interim periods within those fiscal years. 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 plans to adopt the standard using the modified retrospective method on January 1, 2022. The Company does not expect the standard to impact the Consolidated Financial Statements as all currently outstanding convertible instruments will mature prior to the adoption date. See Note 10. Borrowings for detail on the Company's outstanding convertible instruments.

Disposed and Discontinued Opera

Disposed and Discontinued Operations (Notes)	9 Months Ended
	Sep. 30, 2021
Discontinued Operations [Abstract]
Disposed and Discontinued Operations	Management and the Board of Directors periodically conduct strategic reviews of the Company's businesses. On November 28, 2017, the Company completed the sale of its high-end oscillators business (“Timing Device Business”), part of the Precision Devices (“PD”) segment, for $130.0 million, plus purchase price adjustments for a net amount of $135.1 million. On July 7, 2016, the Company completed the sale of its speaker and receiver product line (“Speaker and Receiver Product Line”) for $45.0 million in cash, less purchase price adjustments for a net amount received of $40.6 million. In accordance with ASC 205-20, Presentation of Financial Statements – Discontinued Operations, the results of operations and financial positions of the Timing Device Business and Speaker and Receiver Product Line have been reclassified to discontinued operations for all periods presented as these disposals represent strategic shifts that had a major effect on the Company's results of operations. Summarized results of the Company's discontinued operations are as follows: Nine Months Ended (in millions) September 30, 2021 September 30, 2020 Revenues $ — $ — Operating income — — Earnings from discontinued operations before taxes — — Benefit from income taxes (1) (0.2) (3.7) Earnings from discontinued operations, net of tax $ 0.2 $ 3.7 (1) The Company recorded a tax benefit for a refund received during the first quarter of 2020 related to the Timing Device Business. Assets and liabilities of discontinued operations are summarized below: (in millions) December 31, 2020 Liabilities of discontinued operations: Other liabilities (1) $ 0.6 Total liabilities $ 0.6 (1) This accrual was attributable to an unrecognized tax benefit related to the Speaker and Receiver Product Line. Discontinued operations had no impact on the Company's results of operations for the three months ended September 30, 2021 and 2020. There were no assets and liabilities of discontinued operations as of September 30, 2021.

Inventories, net (Notes)

Inventories, net (Notes)	9 Months Ended
	Sep. 30, 2021
Inventory, Net [Abstract]
Inventories, net	The following table details the major components of inventories, net: (in millions) September 30, 2021 December 31, 2020 Raw materials $ 87.6 $ 89.7 Work in progress 33.6 31.0 Finished goods 71.2 48.4 Subtotal 192.4 169.1 Less reserves (36.7) (39.0) Total $ 155.7 $ 130.1

Property, Plant, and Equipment,

Property, Plant, and Equipment, net (Notes)	9 Months Ended
	Sep. 30, 2021
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment, net	7. Property, Plant, and Equipment, net The following table details the major components of property, plant, and equipment, net: (in millions) September 30, 2021 December 31, 2020 Land $ 13.0 $ 8.0 Buildings and improvements 117.7 111.9 Machinery, equipment, and other 571.6 562.8 Subtotal 702.3 682.7 Less accumulated depreciation (511.7) (491.2) Total $ 190.6 $ 191.5

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets (Notes)	9 Months Ended
	Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	The changes in the carrying value of goodwill by reportable segment for the nine months ended September 30, 2021 are as follows: (in millions) Audio Precision Devices Total Balance at December 31, 2020 $ 878.8 $ 31.2 $ 910.0 Acquisition — 31.3 31.3 Balance at September 30, 2021 $ 878.8 $ 62.5 $ 941.3 The gross carrying value and accumulated amortization for each major class of intangible assets are as follows: September 30, 2021 December 31, 2020 (in millions) Gross Carrying Accumulated Gross Carrying Accumulated Amortized intangible assets: Trademarks $ 2.0 $ 0.5 $ 1.0 $ 0.4 Patents 40.8 39.6 40.8 36.1 Customer relationships 39.7 7.9 12.0 5.2 Developed technology 45.4 11.5 36.5 6.7 Other 2.4 1.1 1.8 0.7 Total 130.3 60.6 92.1 49.1 Unamortized intangible assets: Trademarks 32.0 32.0 IPR&D (1) — 3.7 Total 32.0 35.7 Total intangible assets, net $ 101.7 $ 78.7 (1) The in-process research and development ("IPR&D") project was completed during the third quarter of 2021. The IPR&D asset has been reclassified as a definite-lived intangible asset to be amortized on a straight-line basis over an estimated useful life of 9 years. Amortization expense totaled $4.3 million and $3.3 million for the three months ended September 30, 2021 and 2020, respectively. For the nine months ended September 30, 2021 and 2020, amortization expense was $11.5 million and $9.8 million, respectively. Amortization expense for the next five years, based on current definite-lived intangible balances, is estimated to be as follows: (in millions) Q4 2021 $ 4.4 2022 12.2 2023 11.6 2024 11.6 2025 11.2

Other Comprehensive Earnings

Other Comprehensive Earnings	3 Months Ended
	Sep. 30, 2021
Statement of Other Comprehensive Income [Abstract]
Other Comprehensive Earnings	The amounts recognized in other comprehensive (loss) earnings were as follows: Three Months Ended Three Months Ended September 30, 2021 September 30, 2020 (in millions) Pre-tax Tax Net of tax Pre-tax Tax Net of tax Foreign currency translation $ (3.7) $ — $ (3.7) $ 9.2 $ — $ 9.2 Employee benefit plans 0.2 (0.1) 0.1 0.2 0.1 0.3 Changes in fair value of cash flow hedges (0.3) 0.2 (0.1) 1.1 (0.2) 0.9 Total other comprehensive (loss) earnings $ (3.8) $ 0.1 $ (3.7) $ 10.5 $ (0.1) $ 10.4 Nine Months Ended Nine Months Ended September 30, 2021 September 30, 2020 (in millions) Pre-tax Tax Net of tax Pre-tax Tax Net of tax Foreign currency translation $ (6.4) $ — $ (6.4) $ 5.1 $ — $ 5.1 Employee benefit plans 0.6 0.1 0.7 0.5 — 0.5 Changes in fair value of cash flow hedges (2.1) 0.2 (1.9) 0.5 (0.1) 0.4 Total other comprehensive (loss) earnings $ (7.9) $ 0.3 $ (7.6) $ 6.1 $ (0.1) $ 6.0 The following tables summarize the changes in balances of each component of accumulated other comprehensive loss, net of tax during the nine months ended September 30, 2021 and 2020: (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 (1.9) 0.7 (6.4) (7.6) Balance at September 30, 2021 $ (0.3) $ (21.4) $ (86.4) $ (108.1) (in millions) Cash flow hedges Employee benefit plans Cumulative foreign currency translation adjustments Total Balance at December 31, 2019 $ 0.5 $ (18.7) $ (93.8) $ (112.0) Other comprehensive earnings, net of tax 0.4 0.5 5.1 6.0 Balance at September 30, 2020 $ 0.9 $ (18.2) $ (88.7) $ (106.0) The following tables summarize the amounts reclassified from accumulated other comprehensive loss to earnings: Three Months Ended September 30, (in millions) Statement of Earnings Line 2021 2020 Pension and post-retirement benefit plans: Amortization or settlement of actuarial losses and prior service costs $ 0.2 $ 0.2 Tax Provision for income taxes (0.1) 0.1 Net of tax $ 0.1 $ 0.3 Cash flow hedges: Net gains reclassified into earnings Cost of goods sold $ — $ (0.6) Tax Provision for income taxes 0.1 0.1 Net of tax $ 0.1 $ (0.5) Nine Months Ended September 30, (in millions) Statement of Earnings Line 2021 2020 Pension and post-retirement benefit plans: Amortization or settlement of actuarial losses and prior service costs Other (income) expense, net $ 0.6 $ 0.5 Tax Provision for income taxes 0.1 — Net of tax $ 0.7 $ 0.5 Cash flow hedges: Net gains reclassified into earnings Cost of goods sold $ (1.9) $ (0.2) Tax Provision for income taxes 0.5 0.1 Net of tax $ (1.4) $ (0.1)

Income Taxes (Notes)

Income Taxes (Notes)	9 Months Ended
	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Text Block]	The Company's ETR from continuing operations for the three and nine months ended September 30, 2021 was a 14.2% provision and a 13.1% provision, respectively. During the three and nine months ended September 30, 2021, the ETR from continuing operations was impacted by discrete items totaling $0.4 million of expense and $0.9 million of benefit, respectively. Absent the discrete items, the ETR from continuing operations for the three and nine months ended September 30, 2021 was a 13.0% provision and a 14.5% provision, respectively. The Company's ETR from continuing operations for the three and nine months ended September 30, 2020 was a 29.1% provision and a 26.5% provision, respectively. During the three and nine months ended September 30, 2020, the ETR from continuing operations was impacted by discrete items totaling $1.2 million of benefit, primarily related to a benefit resulting from an increase to the recognized deferred tax assets in the Company's U.S. and Malaysian subsidiaries. Absent the discrete items, the ETR from continuing operations for the three and nine months ended September 30, 2020 was a 44.3% provision and a 32.2% provision, respectively. The Company accrues taxes in various countries where it generates income and applies a valuation allowance in other jurisdictions (primarily the U.S.), which resulted in the provision for both the three and nine months ended September 30, 2021 and 2020. The Company's ETR is favorably impacted by tax holidays granted to the Company in Malaysia. 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 current ETR may be significantly adversely impacted. The continuing operations benefit of the tax holidays in Malaysia for the three and nine months ended September 30, 2021 was approximately $3.9 million and $9.3 million, respectively, or $0.04 and $0.10 on a per share basis. The continuing operations benefit of these incentives for the three and nine months ended September 30, 2020 was approximately $2.7 million and $4.2 million, respectively, or $0.03 and $0.05 on a per share basis. The Company's existing significant tax holiday in Malaysia will expire on December 31, 2021. The Company is pursuing an extension for its current tax holiday and evaluating other strategies to mitigate the impact of the expiring tax holiday. If the Company is unable to extend the current tax holiday or negotiate acceptable new terms, the Company’s ETR may be significantly adversely impacted.

Equity Incentive Program (Notes

Equity Incentive Program (Notes)	9 Months Ended
	Sep. 30, 2021
Share-based Payment Arrangement, Noncash Expense [Abstract]
Equity Incentive Program	Stock-based compensation expense recognized in the Consolidated Statements of Earnings totaled $7.1 million and $4.8 million for the three months ended September 30, 2021 and 2020, respectively. For the nine months ended September 30, 2021 and 2020, stock-based compensation expense was $25.6 million and $12.4 million, respectively. Stock Options and SSARs The expense related to stock options granted in the nine months ended September 30, 2021 and 2020 was estimated on the date of grant using a Black-Scholes option-pricing model based on the assumptions shown in the table below: Nine Months Ended September 30, 2021 2020 Risk-free interest rate 0.06% 0.11% to 1.42% Dividend yield —% —% Expected life (years) 4.5 4.3 to 4.5 Volatility 36.0% 38.8% to 40.6% Fair value at date of grant $6.14 to $6.31 $4.78 to $5.95 The following table summarizes the Company's stock-settled stock appreciation right ("SSAR") and stock option activity for the nine months ended September 30, 2021 (in millions, except share and per share amounts): 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) Outstanding at December 31, 2020 596,537 $ 22.72 5,765,903 $ 17.44 Granted — — 216,963 20.61 Exercised — — (867,386) 16.54 Forfeited — — (90,074) 17.01 Expired (106,477) 22.17 (848,452) 29.52 Outstanding at September 30, 2021 490,060 $ 22.84 $ — 0.9 4,176,954 $ 15.34 $ 14.8 3.0 Exercisable at September 30, 2021 490,060 $ 22.84 $ — 0.9 3,309,977 $ 14.75 $ 13.4 2.4 There was no unrecognized compensation expense related to SSARs at September 30, 2021. At September 30, 2021, unrecognized compensation expense related to stock options not yet exercisable of $3.3 million is expected to be recognized over a weighted-average period of 1.4 years. RSUs The following table summarizes the Company's restricted stock unit ("RSU") activity for the nine months ended September 30, 2021: Share units Weighted-average grant date fair value Unvested at December 31, 2020 1,909,786 $ 16.14 Granted 1,117,408 20.58 Vested (1) (1,049,222) 15.79 Forfeited (157,176) 18.26 Unvested at September 30, 2021 1,820,796 $ 18.82 (1) The number of RSUs vested includes shares that the Company withheld on behalf of employees to satisfy statutory tax withholding requirements. At September 30, 2021, $23.4 million of unrecognized compensation expense related to RSUs is expected to be recognized over a weighted-average period of 1.8 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 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 is 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 is 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 is weighted equally, as the Company expects 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 will be recognized over the remaining service period. Incremental compensation expense is subject to adjustment for the expected achievement of the performance condition based on fiscal 2021 revenues. 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 nine months ended September 30, 2021: Share units Weighted-average grant date fair value Unvested at December 31, 2020 920,973 $ 16.04 Granted 277,183 28.46 Vested (1) (329,092) 13.75 Forfeited (101,483) 19.05 Unvested at September 30, 2021 767,581 $ 21.11 (1) The number of PSUs vested includes shares that the Company withheld on behalf of employees to satisfy statutory tax withholding requirements. At September 30, 2021, $11.9 million of unrecognized compensation expense related to PSUs is expected to be recognized over a weighted-average period of 1.4 years.

Earnings per Share (Notes)

Earnings per Share (Notes)	9 Months Ended
	Sep. 30, 2021
Earnings Per Share [Abstract]
Earnings per Share	Basic and diluted earnings per share were computed as follows: Three Months Ended September 30, Nine Months Ended September 30, (in millions, except share and per share amounts) 2021 2020 2021 2020 Earnings (loss) from continuing operations $ 27.7 $ 5.6 $ 57.6 $ (26.7) Earnings from discontinued operations, net — — 0.2 3.7 Net earnings (loss) $ 27.7 $ 5.6 $ 57.8 $ (23.0) Basic earnings (loss) per common share: Earnings (loss) from continuing operations $ 0.30 $ 0.06 $ 0.62 $ (0.29) Earnings from discontinued operations, net — — 0.01 0.04 Net earnings (loss) $ 0.30 $ 0.06 $ 0.63 $ (0.25) Weighted-average shares outstanding 92,189,329 91,688,765 92,315,146 91,707,702 Diluted earnings (loss) per common share: Earnings (loss) from continuing operations $ 0.29 $ 0.06 $ 0.61 $ (0.29) Earnings from discontinued operations, net — — — 0.04 Net earnings (loss) $ 0.29 $ 0.06 $ 0.61 $ (0.25) Diluted weighted-average shares outstanding 94,143,034 92,473,318 94,780,940 91,707,702 As the Company either elected or intended to settle the principal amount of the Notes in cash for all periods presented, the treasury stock method was used to calculate any potential dilutive effect of the conversion option on diluted earnings per share, if applicable. For the three and nine months ended September 30, 2021, the weighted-average number of anti-dilutive potential common shares excluded from the diluted earnings per share calculation above was 1,129,231 and 1,299,454, respectively. For the three and nine months ended September 30, 2020, the weighted-average number of anti-dilutive potential common shares excluded from the diluted earnings per share calculation above was 4,559,131 and 5,102,219, respectively.

Commitments and Contingent Liab

Commitments and Contingent Liabilities (Notes)	9 Months Ended
	Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingent Liabilities	September 30, 2021 and December 31, 2020.

Segment Information (Notes)

Segment Information (Notes)	9 Months Ended
	Sep. 30, 2021
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 September 30, Nine Months Ended September 30, (in millions) 2021 2020 2021 2020 Revenues: Audio $ 177.7 $ 164.8 $ 490.6 $ 389.4 Precision Devices 55.3 41.0 143.2 131.7 Total revenues $ 233.0 $ 205.8 $ 633.8 $ 521.1 Earnings (loss) from continuing operations before interest and income taxes: Audio $ 36.6 $ 17.8 $ 95.0 $ (0.5) Precision Devices 14.0 8.0 28.3 26.2 Total segments 50.6 25.8 123.3 25.7 Corporate expense / other 14.1 13.2 44.7 34.3 Interest expense, net 4.2 4.7 12.3 12.5 Earnings (loss) before income taxes and discontinued operations 32.3 7.9 66.3 (21.1) Provision for income taxes 4.6 2.3 8.7 5.6 Earnings (loss) from continuing operations $ 27.7 $ 5.6 $ 57.6 $ (26.7) Information regarding assets of the Company's reportable segments: Total Assets (in millions) September 30, 2021 December 31, 2020 Audio $ 1,461.7 $ 1,470.4 Precision Devices 257.4 179.2 Corporate / eliminations 4.1 5.3 Total $ 1,723.2 $ 1,654.9 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 September 30, Nine Months Ended September 30, (in millions) 2021 2020 2021 2020 Asia $ 163.4 $ 151.7 $ 452.0 $ 368.3 United States 42.2 28.8 109.3 86.8 Europe 24.6 23.1 65.4 59.8 Other Americas 1.6 1.3 3.9 2.8 Other 1.2 0.9 3.2 3.4 Total $ 233.0 $ 205.8 $ 633.8 $ 521.1 Receivables, net from contracts with customers were $120.3 million and $123.8 million as of September 30, 2021 and December 31, 2020, respectively. As of September 30, 2021, our total remaining performance obligations are immaterial.

Basis of Presentation (Policies

Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Accounting Policy	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, 2020 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 rapidly evolving. 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. On May 3, 2021, the Company acquired all of the outstanding shares of common stock of Integrated Microwave Corporation ("IMC"), a manufacturer of RF filters. See Note 4. Acquisition for additional information related to the transaction. 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. 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 nine months ended September 30, 2021, the Company repurchased 1,011,124 shares of common stock for a total of $20.0 million.

Recent Accounting Standards New

Recent Accounting Standards New Accounting Pronouncements, Policy (Policies)	9 Months Ended
	Sep. 30, 2021
Accounting Policies [Abstract]
New Accounting Pronouncements, Policy [Policy Text Block]	Recently Issued 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 is effective for public business entities for fiscal years beginning after December 15, 2021, including interim periods within those fiscal years. 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 plans to adopt the standard using the modified retrospective method on January 1, 2022. The Company does not expect the standard to impact the Consolidated Financial Statements as all currently outstanding convertible instruments will mature prior to the adoption date. See Note 10. Borrowings for detail on the Company's outstanding convertible instruments.

Discontinued Operations (Tables

Discontinued Operations (Tables)	9 Months Ended
	Sep. 30, 2021
Discontinued Operations [Abstract]
Summarized Results and Assets and Liabilities of Discontinued Operations	Summarized results of the Company's discontinued operations are as follows: Nine Months Ended (in millions) September 30, 2021 September 30, 2020 Revenues $ — $ — Operating income — — Earnings from discontinued operations before taxes — — Benefit from income taxes (1) (0.2) (3.7) Earnings from discontinued operations, net of tax $ 0.2 $ 3.7 (1) The Company recorded a tax benefit for a refund received during the first quarter of 2020 related to the Timing Device Business. Assets and liabilities of discontinued operations are summarized below: (in millions) December 31, 2020 Liabilities of discontinued operations: Other liabilities (1) $ 0.6 Total liabilities $ 0.6

Business Combinations (Tables)

Business Combinations (Tables)	9 Months Ended
	Sep. 30, 2021
Business Combinations [Abstract]
Schedule of the Final Allocation of the Purchase Price to Net Assets	The table below represents a preliminary 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 31.3 Assumed current liabilities (1.2) Total purchase price $ 80.7

Inventories (Tables)

Inventories (Tables)	9 Months Ended
	Sep. 30, 2021
Inventory, Net [Abstract]
Components of Inventory	The following table details the major components of inventories, net: (in millions) September 30, 2021 December 31, 2020 Raw materials $ 87.6 $ 89.7 Work in progress 33.6 31.0 Finished goods 71.2 48.4 Subtotal 192.4 169.1 Less reserves (36.7) (39.0) Total $ 155.7 $ 130.1

Property, Plant, and Equipmen_2

Property, Plant, and Equipment, net (Tables)	9 Months Ended
	Sep. 30, 2021
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) September 30, 2021 December 31, 2020 Land $ 13.0 $ 8.0 Buildings and improvements 117.7 111.9 Machinery, equipment, and other 571.6 562.8 Subtotal 702.3 682.7 Less accumulated depreciation (511.7) (491.2) Total $ 190.6 $ 191.5

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2021
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: September 30, 2021 December 31, 2020 (in millions) Gross Carrying Accumulated Gross Carrying Accumulated Amortized intangible assets: Trademarks $ 2.0 $ 0.5 $ 1.0 $ 0.4 Patents 40.8 39.6 40.8 36.1 Customer relationships 39.7 7.9 12.0 5.2 Developed technology 45.4 11.5 36.5 6.7 Other 2.4 1.1 1.8 0.7 Total 130.3 60.6 92.1 49.1 Unamortized intangible assets: Trademarks 32.0 32.0 IPR&D (1) — 3.7 Total 32.0 35.7 Total intangible assets, net $ 101.7 $ 78.7
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) Q4 2021 $ 4.4 2022 12.2 2023 11.6 2024 11.6 2025 11.2

Restructuring and Related Activ

Restructuring and Related Activities (Tables)	9 Months Ended
	Sep. 30, 2021
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 September 30, Nine Months Ended September 30, (in millions) 2021 2020 2021 2020 Audio $ — $ — $ 0.3 $ 11.0 Precision Devices — 0.1 — 0.1 Corporate — — — 1.7 Total $ — $ 0.1 $ 0.3 $ 12.8
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, 2020 $ 1.9 $ 0.7 $ 2.6 Restructuring charges 0.3 — 0.3 Payments (1.7) (0.7) (2.4) Balance at September 30, 2021 $ 0.5 $ — $ 0.5
Schedule of Restructuring Reserve by Balance Sheet Location	The severance and restructuring accruals are recorded in the following line items on the Consolidated Balance Sheets: (in millions) September 30, 2021 December 31, 2020 Other accrued expenses $ 0.5 $ 2.4 Other liabilities — 0.2 Total $ 0.5 $ 2.6

Borrowings (Tables)

Borrowings (Tables)	9 Months Ended
	Sep. 30, 2021
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments	Borrowings (net of debt issuance costs, debt discount, and amortization) consist of the following: (in millions) September 30, 2021 December 31, 2020 3.25% convertible senior notes $ 171.8 $ 165.1 Revolving credit facility — — Total 171.8 165.1 Less current maturities 171.8 165.1 Total long-term debt $ — $ —
Contractual Obligation, Fiscal Year Maturity Schedule	Total debt principal payments over the next five years are as follows: (in millions) Q4 2021 2022 2023 2024 2025 Debt principal payments $ 172.5 $ — $ — $ — $ —
Schedule of Convertible Debt	The Notes consist of the following: (in millions) September 30, 2021 December 31, 2020 Liability component: Principal $ 172.5 $ 172.5 Less debt issuance costs and debt discount, net of amortization (0.7) (7.4) Total 171.8 165.1 Less current maturities (1) 171.8 165.1 Long-term portion $ — $ — Equity component (2) $ 29.9 $ 29.9 (1) There are no required principal payments due until maturity in November 2021. (2) Recorded in the Consolidated Balance Sheets within additional paid-in capital, inclusive of the $1.3 million of issuance costs in equity.
Schedule of Convertible Debt Interest Expense	The following table sets forth total interest expense recognized related to the Notes: Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2021 2020 2021 2020 3.25% coupon $ 1.4 $ 1.4 $ 4.2 $ 4.2 Amortization of debt issuance costs 0.2 0.2 0.7 0.7 Amortization of debt discount 2.1 1.9 6.0 5.5 Total $ 3.7 $ 3.5 $ 10.9 $ 10.4

Other Comprehensive Loss (Table

Other Comprehensive Loss (Tables)	9 Months Ended
	Sep. 30, 2021
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Components of other comprehensive (loss) earnings	The amounts recognized in other comprehensive (loss) earnings were as follows: Three Months Ended Three Months Ended September 30, 2021 September 30, 2020 (in millions) Pre-tax Tax Net of tax Pre-tax Tax Net of tax Foreign currency translation $ (3.7) $ — $ (3.7) $ 9.2 $ — $ 9.2 Employee benefit plans 0.2 (0.1) 0.1 0.2 0.1 0.3 Changes in fair value of cash flow hedges (0.3) 0.2 (0.1) 1.1 (0.2) 0.9 Total other comprehensive (loss) earnings $ (3.8) $ 0.1 $ (3.7) $ 10.5 $ (0.1) $ 10.4 Nine Months Ended Nine Months Ended September 30, 2021 September 30, 2020 (in millions) Pre-tax Tax Net of tax Pre-tax Tax Net of tax Foreign currency translation $ (6.4) $ — $ (6.4) $ 5.1 $ — $ 5.1 Employee benefit plans 0.6 0.1 0.7 0.5 — 0.5 Changes in fair value of cash flow hedges (2.1) 0.2 (1.9) 0.5 (0.1) 0.4 Total other comprehensive (loss) earnings $ (7.9) $ 0.3 $ (7.6) $ 6.1 $ (0.1) $ 6.0
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 nine months ended September 30, 2021 and 2020: (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 (1.9) 0.7 (6.4) (7.6) Balance at September 30, 2021 $ (0.3) $ (21.4) $ (86.4) $ (108.1) (in millions) Cash flow hedges Employee benefit plans Cumulative foreign currency translation adjustments Total Balance at December 31, 2019 $ 0.5 $ (18.7) $ (93.8) $ (112.0) Other comprehensive earnings, net of tax 0.4 0.5 5.1 6.0 Balance at September 30, 2020 $ 0.9 $ (18.2) $ (88.7) $ (106.0) The following tables summarize the amounts reclassified from accumulated other comprehensive loss to earnings: Three Months Ended September 30, (in millions) Statement of Earnings Line 2021 2020 Pension and post-retirement benefit plans: Amortization or settlement of actuarial losses and prior service costs $ 0.2 $ 0.2 Tax Provision for income taxes (0.1) 0.1 Net of tax $ 0.1 $ 0.3 Cash flow hedges: Net gains reclassified into earnings Cost of goods sold $ — $ (0.6) Tax Provision for income taxes 0.1 0.1 Net of tax $ 0.1 $ (0.5) Nine Months Ended September 30, (in millions) Statement of Earnings Line 2021 2020 Pension and post-retirement benefit plans: Amortization or settlement of actuarial losses and prior service costs Other (income) expense, net $ 0.6 $ 0.5 Tax Provision for income taxes 0.1 — Net of tax $ 0.7 $ 0.5 Cash flow hedges: Net gains reclassified into earnings Cost of goods sold $ (1.9) $ (0.2) Tax Provision for income taxes 0.5 0.1 Net of tax $ (1.4) $ (0.1)

Equity Incentive Program (Table

Equity Incentive Program (Tables)	9 Months Ended
	Sep. 30, 2021
Share-based Payment Arrangement, Noncash Expense [Abstract]
Schedule of Black-Scholes Option-Pricing Assumptions	The expense related to stock options granted in the nine months ended September 30, 2021 and 2020 was estimated on the date of grant using a Black-Scholes option-pricing model based on the assumptions shown in the table below: Nine Months Ended September 30, 2021 2020 Risk-free interest rate 0.06% 0.11% to 1.42% Dividend yield —% —% Expected life (years) 4.5 4.3 to 4.5 Volatility 36.0% 38.8% to 40.6% Fair value at date of grant $6.14 to $6.31 $4.78 to $5.95
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 nine months ended September 30, 2021 (in millions, except share and per share amounts): 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) Outstanding at December 31, 2020 596,537 $ 22.72 5,765,903 $ 17.44 Granted — — 216,963 20.61 Exercised — — (867,386) 16.54 Forfeited — — (90,074) 17.01 Expired (106,477) 22.17 (848,452) 29.52 Outstanding at September 30, 2021 490,060 $ 22.84 $ — 0.9 4,176,954 $ 15.34 $ 14.8 3.0 Exercisable at September 30, 2021 490,060 $ 22.84 $ — 0.9 3,309,977 $ 14.75 $ 13.4 2.4
Schedule of Restricted Stock Units Award Activity	The following table summarizes the Company's restricted stock unit ("RSU") activity for the nine months ended September 30, 2021: Share units Weighted-average grant date fair value Unvested at December 31, 2020 1,909,786 $ 16.14 Granted 1,117,408 20.58 Vested (1) (1,049,222) 15.79 Forfeited (157,176) 18.26 Unvested at September 30, 2021 1,820,796 $ 18.82 (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 nine months ended September 30, 2021: Share units Weighted-average grant date fair value Unvested at December 31, 2020 920,973 $ 16.04 Granted 277,183 28.46 Vested (1) (329,092) 13.75 Forfeited (101,483) 19.05 Unvested at September 30, 2021 767,581 $ 21.11 (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)	9 Months Ended
	Sep. 30, 2021
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 September 30, Nine Months Ended September 30, (in millions, except share and per share amounts) 2021 2020 2021 2020 Earnings (loss) from continuing operations $ 27.7 $ 5.6 $ 57.6 $ (26.7) Earnings from discontinued operations, net — — 0.2 3.7 Net earnings (loss) $ 27.7 $ 5.6 $ 57.8 $ (23.0) Basic earnings (loss) per common share: Earnings (loss) from continuing operations $ 0.30 $ 0.06 $ 0.62 $ (0.29) Earnings from discontinued operations, net — — 0.01 0.04 Net earnings (loss) $ 0.30 $ 0.06 $ 0.63 $ (0.25) Weighted-average shares outstanding 92,189,329 91,688,765 92,315,146 91,707,702 Diluted earnings (loss) per common share: Earnings (loss) from continuing operations $ 0.29 $ 0.06 $ 0.61 $ (0.29) Earnings from discontinued operations, net — — — 0.04 Net earnings (loss) $ 0.29 $ 0.06 $ 0.61 $ (0.25) Diluted weighted-average shares outstanding 94,143,034 92,473,318 94,780,940 91,707,702

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2021
Segment Reporting [Abstract]
Revenue and Earnings from continuing operations by market segment	Three Months Ended September 30, Nine Months Ended September 30, (in millions) 2021 2020 2021 2020 Revenues: Audio $ 177.7 $ 164.8 $ 490.6 $ 389.4 Precision Devices 55.3 41.0 143.2 131.7 Total revenues $ 233.0 $ 205.8 $ 633.8 $ 521.1 Earnings (loss) from continuing operations before interest and income taxes: Audio $ 36.6 $ 17.8 $ 95.0 $ (0.5) Precision Devices 14.0 8.0 28.3 26.2 Total segments 50.6 25.8 123.3 25.7 Corporate expense / other 14.1 13.2 44.7 34.3 Interest expense, net 4.2 4.7 12.3 12.5 Earnings (loss) before income taxes and discontinued operations 32.3 7.9 66.3 (21.1) Provision for income taxes 4.6 2.3 8.7 5.6 Earnings (loss) from continuing operations $ 27.7 $ 5.6 $ 57.6 $ (26.7)
Reconciliation of Assets from Segment to Consolidated	Information regarding assets of the Company's reportable segments: Total Assets (in millions) September 30, 2021 December 31, 2020 Audio $ 1,461.7 $ 1,470.4 Precision Devices 257.4 179.2 Corporate / eliminations 4.1 5.3 Total $ 1,723.2 $ 1,654.9
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 September 30, Nine Months Ended September 30, (in millions) 2021 2020 2021 2020 Asia $ 163.4 $ 151.7 $ 452.0 $ 368.3 United States 42.2 28.8 109.3 86.8 Europe 24.6 23.1 65.4 59.8 Other Americas 1.6 1.3 3.9 2.8 Other 1.2 0.9 3.2 3.4 Total $ 233.0 $ 205.8 $ 633.8 $ 521.1

Basis of Presentation (Details)

Basis of Presentation (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Noncash Investing and Financing Items
Payments for Repurchase of Common Stock	$ 20	$ 15
Treasury Stock, Shares, Acquired	1,011,124
Operating Lease, Liability, Noncurrent	$ 15.8		$ 18.7
Treasury Stock, Shares	2,089,487		1,078,363
Purchases of property and equipment included in accounts payable	$ 3.6	$ 1.9

Discontinued Operations (Detail

Discontinued Operations (Details) - USD ($) $ in Millions	Jul. 07, 2016	Sep. 30, 2021	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Nov. 28, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration received for disposal group	$ 45						$ 130
Proceeds from the sale of business	$ 40.6		$ 135.1
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent						$ 0.6
Benefit from income taxes (1)		$ (0.2)		$ (0.2)
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax		0		0	$ 0
Disposal Group, Including Discontinued Operation, Liabilities		0		0		$ 0.6
Assets of discontinued operations		0		0
Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Operating Expense		0		0	0
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax		0.2		0.2	3.7
Benefit from income taxes (1)					(3.7)
Disposal Group, Including Discontinued Operation, Revenue		$ 0		$ 0	$ 0

Business Combinations (Details)

Business Combinations (Details) - USD ($) $ in Millions	Dec. 20, 2019	Sep. 30, 2021	Sep. 30, 2021	May 03, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets
Goodwill		$ 941.3	$ 941.3		$ 910
Integrated Microwave Corporation
Business Combination Segment Allocation [Line Items]
Payments to Acquire Businesses, Gross	$ 80.7
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual			7
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual			$ 0.2
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				31.3
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities				(1.2)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net				80.7
Integrated Microwave Corporation | 100000
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	Sep. 30, 2021	Dec. 31, 2020
Inventory, Net [Abstract]
Raw materials	$ 87.6	$ 89.7
Work in progress	33.6	31
Finished goods	71.2	48.4
Subtotal	192.4	169.1
Less reserves	(36.7)	(39)
Total	$ 155.7	$ 130.1

Property, Plant and Equipment,

Property, Plant and Equipment, net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Property, Plant and Equipment
Cost	$ 702.3		$ 702.3		$ 682.7
Less accumulated depreciation	(511.7)		(511.7)		(491.2)
Total	190.6		190.6		191.5
Depreciation	11.5	$ 11.9	35.1	$ 35.9
Restructuring charges	0	0.1	0.3	10.5
Severance Pay and Contract Termination and Other Costs
Property, Plant and Equipment
Restructuring charges	0	0.1	0.3	$ 12.8
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	13		13		8
Buildings and improvements
Property, Plant and Equipment
Cost	117.7		117.7		111.9
Machinery, equipment, and other
Property, Plant and Equipment
Cost	$ 571.6		$ 571.6		$ 562.8

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets - Goodwill (Details) $ in Millions	9 Months Ended
	Sep. 30, 2021USD ($)
Goodwill [Roll Forward]
Balance at December 31, 2020	$ 910
Goodwill, Acquired During Period	31.3
44469	941.3
Audio
Goodwill [Roll Forward]
Balance at December 31, 2020	878.8
Goodwill, Acquired During Period	0
44469	878.8
Precision Devices
Goodwill [Roll Forward]
Balance at December 31, 2020	31.2
Goodwill, Acquired During Period	31.3
44469	$ 62.5

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	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Finite-Lived Intangible Assets
Gross carrying amount	$ 130.3		$ 130.3	$ 130.3		$ 92.1
Accumulated amortization	60.6		60.6	60.6		49.1
Unamortized intangible assets, gross carrying amount	32		32	32		35.7
Intangible assets, net	101.7		101.7	101.7		78.7
Amortization expense	4.3	$ 3.3		11.5	$ 9.8
2021	4.4		4.4	4.4
2022	12.2		12.2	12.2
2023	11.6		11.6	11.6
2024	11.6		11.6	11.6
2025	11.2		11.2	11.2
Trademarks
Finite-Lived Intangible Assets
Unamortized intangible assets, gross carrying amount	32		32	32		32
In Process Research and Development [Member]
Finite-Lived Intangible Assets
Unamortized intangible assets, gross carrying amount	0		0	0		3.7
Trademarks
Finite-Lived Intangible Assets
Gross carrying amount	2		2	2		1
Accumulated amortization	0.5		0.5	0.5		0.4
Patents
Finite-Lived Intangible Assets
Gross carrying amount	40.8		40.8	40.8		40.8
Accumulated amortization	39.6		39.6	39.6		36.1
Customer relationships
Finite-Lived Intangible Assets
Gross carrying amount	39.7		39.7	39.7		12
Accumulated amortization	7.9		$ 7.9	7.9		5.2
Customer relationships | Integrated Microwave Corporation
Finite-Lived Intangible Assets
Finite-Lived Intangible Asset, Useful Life			8 years
100000
Finite-Lived Intangible Assets
Gross carrying amount	45.4		$ 45.4	45.4		36.5
Accumulated amortization	11.5		$ 11.5	11.5		6.7
100000 | 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	2.4		1.8
Accumulated amortization	$ 1.1		$ 1.1	$ 1.1		$ 0.7
In Process Research and Development [Member]
Finite-Lived Intangible Assets
Finite-Lived Intangible Asset, Useful Life	9 years

Restructuring and Related Act_2

Restructuring and Related Activities - Restructuring Charges by Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Restructuring Cost and Reserve
Restructuring charges	$ 0	$ 0.1	$ 0.3	$ 10.5
Restructuring and Related Cost, Incurred Cost			0.3
Intelligent Audio [Member]
Restructuring Cost and Reserve
Restructuring charges		0		8.3
Severance Pay and Contract Termination and Other Costs
Restructuring Cost and Reserve
Restructuring charges	0	0.1	0.3	12.8
Severance Pay and Benefits
Restructuring Cost and Reserve
Restructuring and Related Cost, Incurred Cost			0.3
Contract Termination and Other Costs
Restructuring Cost and Reserve
Restructuring and Related Cost, Incurred Cost			0
Operating Segments | Audio | Severance Pay and Contract Termination and Other Costs
Restructuring Cost and Reserve
Restructuring charges	0	0	0.3	11
Operating Segments | Precision Devices | Severance Pay and Contract Termination and Other Costs
Restructuring Cost and Reserve
Restructuring charges	0	0.1	0	0.1
Operating Segments | Corporate, Non-Segment [Member] | Severance Pay and Contract Termination and Other Costs
Restructuring Cost and Reserve
Restructuring charges	0	0
Corporate, Non-Segment [Member] | Severance Pay and Contract Termination and Other Costs
Restructuring Cost and Reserve
Restructuring charges			0	1.7
Cost of Goods Sold, Restructuring Charges | Severance Pay and Contract Termination and Other Costs
Restructuring Cost and Reserve
Restructuring charges	0	0		2.3
Cost of Goods Sold, Restructuring Charges | Severance Pay and Benefits | Audio
Restructuring Cost and Reserve
Restructuring charges		0.1		4.5
Cost of Goods Sold, Restructuring Charges | Severance Pay and Benefits | Intelligent Audio [Member]
Restructuring Cost and Reserve
Restructuring charges				5.4
Cost of Goods Sold, Restructuring Charges | Contract Termination and Other Costs | Intelligent Audio [Member]
Restructuring Cost and Reserve
Restructuring charges				1.7
Cost of Goods Sold, Restructuring Charges | Contract Termination [Member] | Intelligent Audio [Member]
Restructuring Cost and Reserve
Restructuring charges		1.2
Operating Expense | Severance Pay and Contract Termination and Other Costs
Restructuring Cost and Reserve
Restructuring charges	$ 0		$ 0.3
Restructuring Charges | Severance Pay and Contract Termination and Other Costs
Restructuring Cost and Reserve
Restructuring charges		$ 0.1		$ 10.5

Restructuring and Related Act_3

Restructuring and Related Activities - Restructuring Accrual Activities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Restructuring Cost and Reserve
Restructuring charges	$ 0	$ 0.1	$ 0.3	$ 10.5
Restructuring Reserve [Roll Forward]
Severance and other restructuring reserve, beginning balance			2.6
Restructuring charges			0.3
Payments			(2.4)
Severance and other restructuring reserve, ending balance	0.5		0.5
Severance Pay and Contract Termination and Other Costs
Restructuring Cost and Reserve
Restructuring charges	0	0.1	0.3	12.8
Severance Pay and Benefits
Restructuring Reserve [Roll Forward]
Severance and other restructuring reserve, beginning balance			1.9
Restructuring charges			0.3
Payments			(1.7)
Severance and other restructuring reserve, ending balance	0.5		0.5
Contract Termination and Other Costs
Restructuring Reserve [Roll Forward]
Severance and other restructuring reserve, beginning balance			0.7
Restructuring charges			0
Payments			(0.7)
Severance and other restructuring reserve, ending balance	0		0
Cost of Goods Sold, Restructuring Charges | Severance Pay and Contract Termination and Other Costs
Restructuring Cost and Reserve
Restructuring charges	0	0		2.3
Operating Expense | Severance Pay and Contract Termination and Other Costs
Restructuring Cost and Reserve
Restructuring charges	$ 0		$ 0.3
Restructuring Charges | Severance Pay and Contract Termination and Other Costs
Restructuring Cost and Reserve
Restructuring charges		$ 0.1		$ 10.5

Restructuring and Related Act_4

Restructuring and Related Activities - Balance Sheet Location (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Restructuring Cost and Reserve
Severance and restructuring accrual	$ 0.5	$ 2.6
Other accrued expenses
Restructuring Cost and Reserve
Severance and restructuring accrual	0.5	2.4
Other liabilities
Restructuring Cost and Reserve
Severance and restructuring accrual	$ 0	$ 0.2

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		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivative
Cost of goods sold	$ 136.1	$ 130.6	$ 375.2	$ 339.6
Interest expense, net	(4.2)	(4.7)	(12.3)	(12.5)
Other expense (income), net	$ 1.9	$ (1)	$ 3.4	$ (0.2)

Borrowings (Details)

Borrowings (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Long-term borrowings
Long-term debt	$ 171.8	$ 165.1
Less: current maturities	171.8	165.1
Long-term portion	0	0
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year	172.5
Long-term Debt, Maturities, Repayments of Principal in Year Two	0
Long-term Debt, Maturities, Repayments of Principal in Year Three	0
Convertible Debt | Convertible Notes Due Twenty Twenty One
Long-term borrowings
Convertible Notes Payable	171.8	165.1
Long-term Debt, Maturities, Repayments of Principal in Year Four	0
Debt Instrument, Unamortized Discount	0.7	7.4
Line of Credit | Credit Facility due October 11, 2022
Long-term borrowings
Long-term Line of Credit	0	$ 0
Long-term Debt, Maturities, Repayments of Principal in Year Five	$ 0

Borrowings Convertible Debt (De

Borrowings Convertible Debt (Details) - Convertible Debt - Convertible Notes Due Twenty Twenty One $ / shares in Units, $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2021USD ($)$ / shares	Sep. 30, 2020USD ($)	Jun. 30, 2016USD ($)	Sep. 30, 2021USD ($)$ / shares	Sep. 30, 2020USD ($)	Dec. 31, 2020USD ($)	May 04, 2016USD ($)$ / shares
Schedule of Convertible Debt
Debt Instrument, Interest Rate, Stated Percentage							3.25%
Debt Instrument, Convertible, Conversion Ratio				54.2741
Debt Instrument, Convertible, Conversion Price | $ / shares	$ 18.4250			$ 18.4250
Debt Issuance Costs, Net	$ 5			$ 5
Debt Issuance Costs Attributable to the Equity Component				1.3
Debt Instrument, Face Amount	172.5			172.5		$ 172.5	$ 172.5
Debt Instrument, Unamortized Discount	(0.7)			(0.7)		(7.4)
Convertible Notes Payable	171.8			171.8		165.1
Convertible Notes Payable, Current	(171.8)			(171.8)		(165.1)
Convertible Notes Payable, Noncurrent	0			0		0
Debt Instrument, Convertible, Carrying Amount of Equity Component	29.9			29.9		$ 29.9
Debt Instrument, Fair Value Disclosure	186.4			186.4
Interest Expense, Debt, Excluding Amortization	1.4	$ 1.4		4.2	$ 4.2
Amortization of Debt Issuance Costs	0.2	0.2		0.7	0.7
Amortization of Debt Discount (Premium)	2.1	1.9		6	5.5
Interest Expense, Debt	$ 3.7	$ 3.5		$ 10.9	$ 10.4
Payments for Hedge, Financing Activities			$ 44.5
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	9 Months Ended
	Sep. 30, 2021USD ($)	Sep. 30, 2021USD ($)	Sep. 30, 2020	Dec. 31, 2020USD ($)
Schedule of Term Loan and Revolving Credit Facilities [Line Items]
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
Line of Credit | Weighted Average
Schedule of Term Loan and Revolving Credit Facilities [Line Items]
Line of Credit Facility, Commitment Fee Percentage		0.26%	0.25%
Line of Credit | Weighted Average | London Interbank Offered Rate (LIBOR)
Schedule of Term Loan and Revolving Credit Facilities [Line Items]
Debt Instrument, Interest Rate, Effective Percentage			2.18%
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	$ 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 October 11, 2022 | Line of Credit
Schedule of Term Loan and Revolving Credit Facilities [Line Items]
Long-term Line of Credit	$ 0	$ 0		$ 0

Other Comprehensive Loss - OCI

Other Comprehensive Loss - OCI (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Foreign currency translation adjustments [Abstract]
Foreign currency translation	$ (3.7)	$ 9.2	$ (6.4)	$ 5.1
Foreign currency translation, tax	0	0	0	0
Foreign currency translation, net of tax	(3.7)	9.2	(6.4)	5.1
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	0.6	0.5
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax, Attributable to Parent	(0.1)	0.1	0.1	0
Net change in employee benefit plans	0.1	0.3	0.7	0.5
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(0.1)	0.9	(1.9)	0.4
Changes in fair value of cash flow hedges:
Changes in fair value of cash flow hedges, before tax	(0.3)	1.1	(2.1)	0.5
Changes in fair value of cash flow hedges, tax	0.2	(0.2)	0.2	(0.1)
Total other comprehensive earnings [Abstract]
Other comprehensive loss, before tax	(3.8)	10.5	(7.9)	6.1
Other comprehensive loss, tax	0.1	(0.1)	0.3	(0.1)
Other comprehensive (loss) earnings, net of tax	(3.7)	10.4	(7.6)	6
Net losses (gains) reclassified into earnings	$ 0.1	$ (0.5)	$ (1.4)	$ (0.1)

Other Comprehensive Loss - AOCI

Other Comprehensive Loss - AOCI (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
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	$ 0.6	$ 0.5
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax	0.1	(0.1)	(0.1)	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax	0.1	0.3	0.7	0.5
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	0	(0.6)	(1.9)	(0.2)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	0.1	0.1	0.5	0.1
Net losses (gains) reclassified into earnings	0.1	(0.5)	(1.4)	(0.1)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance			(100.5)	(112)
Other comprehensive (loss) earnings, net of tax	(3.7)	10.4	(7.6)	6
Ending balance	(108.1)	(106)	(108.1)	(106)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance			1.6	0.5
Other comprehensive (loss) earnings, net of tax			(1.9)	0.4
Ending balance	(0.3)	0.9	(0.3)	0.9
Employee benefit plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance			(22.1)	(18.7)
Other comprehensive (loss) earnings, net of tax			0.7	0.5
Ending balance	(21.4)	(18.2)	(21.4)	(18.2)
Cumulative foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance			(80)	(93.8)
Other comprehensive (loss) earnings, net of tax			(6.4)	5.1
Ending balance	$ (86.4)	$ (88.7)	$ (86.4)	$ (88.7)

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Tax Holiday [Line Items]
Share-based Payment Arrangement, Expense	$ 7.1	$ 4.8	$ 25.6	$ 12.4
Effective tax rate (benefit) provision	14.20%	29.10%	13.10%	(26.50%)
Income Tax Expense (Benefit)	$ 4.6	$ 2.3	$ 8.7	$ 5.6
Other expense (income), net	1.9	(1)	3.4	$ (0.2)
Effective Income Tax Rate Reconciliation, Discrete Items	$ 0.4	$ (1.2)	$ (0.9)
Effective Tax Rate Excluding Discrete Items	(13.00%)	(44.30%)	(14.50%)	(32.20%)
Foreign Tax Authority
Income Tax Holiday [Line Items]
Effective income tax rate reconciliation, tax holiday	$ 3.9	$ 2.7	$ 9.3	$ 4.2
Holiday benefit (usd per share)	$ 0.04	$ 0.03	$ 0.10	$ 0.05

Equity Incentive Program - Stoc

Equity Incentive Program - Stock Options and SSARs (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Payment Arrangement, Expense	$ 7,100,000	$ 4,800,000	$ 25,600,000	$ 12,400,000
SSARs
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 0		$ 0
Number of Shares [Roll Forward]
Beginning balance			596,537
Granted			0
Exercised			0
Forfeited			0
Expired			(106,477)
Ending balance	490,060		490,060
Exercised	490,060		490,060
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instrument Other than Options, Expired in Period, Weighted Average Exercise Price			$ 22.17
Weighted Average Grant Date Fair Value
Beginning balance			22.72
Granted			0
Exercised			0
Forfeited			0
Ending balance	$ 22.84		22.84
Exercisable	$ 22.84		$ 22.84
SARS and Options, Additional Disclosures
SSARs, aggregate intrinsic value, outstanding	$ 0		$ 0
SSARs, aggregate intrinsic value, exercisable	0		$ 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	$ 3,300,000		$ 3,300,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Risk-free interest rate			0.06%
Dividend yield			0.00%	0.00%
Expected life (years)			4 years 6 months
Volatility			36.00%
Stock Options, Number of Shares
Beginning balance			5,765,903
Granted			216,963
Exercised			(867,386)
Forfeited			(90,074)
Expired			(848,452)
Ending balance	4,176,954		4,176,954
Exercisable	3,309,977		3,309,977
Stock Options, Weighted Average Exercise Price
Beginning balance			$ 17.44
Granted			20.61
Exercised			16.54
Forfeited			17.01
Expired			29.52
Ending balance	$ 15.34		15.34
Exercisable	$ 14.75		$ 14.75
SARS and Options, Additional Disclosures
Options, aggregate intrinsic value, outstanding	$ 14,800,000		$ 14,800,000
Options, aggregate intrinsic value, exercisable	$ 13,400,000		$ 13,400,000
Options, weighted average remaining contractual term, outstanding			3 years
Options, weighted average remaining contractual term, exercisable			2 years 4 months 24 days
Minimum [Member] | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Risk-free interest rate				0.11%
Expected life (years)				4 years 3 months 18 days
Volatility				38.80%
Fair value at date of grant			$ 6.14	$ 4.78
Maximum [Member] | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Risk-free interest rate				1.42%
Expected life (years)				4 years 6 months
Volatility				40.60%
Fair value at date of grant			$ 6.31	$ 5.95

Equity Incentive Program - RSUs

Equity Incentive Program - RSUs (Details) - Restricted Stock Units (RSUs)	9 Months Ended
	Sep. 30, 2021$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	1 year 9 months 18 days
Number of Shares [Roll Forward]
Beginning balance | shares	1,909,786
Granted | shares	1,117,408
Vested (1) | shares	(1,049,222)
Forfeited | shares	(157,176)
Ending balance | shares	1,820,796
Weighted Average Grant Date Fair Value
Beginning balance | $ / shares	$ 16.14
Granted | $ / shares	20.58
Vested (1) | $ / shares	15.79
Forfeited | $ / shares	18.26
Ending balance | $ / shares	$ 18.82

Equity Incentive Program Equity

Equity Incentive Program Equity Incentive Program - PSUs (Details) - Performance Shares $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2021USD ($)$ / sharesshares	Sep. 30, 2020numberOfGrantees	Sep. 30, 2019numberOfGrantees	Sep. 30, 2018numberOfGrantees
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $	$ 11.9
Number of Shares [Roll Forward]
Beginning balance | shares	920,973
Granted | shares	277,183
Vested (1) | shares	(329,092)
Forfeited | shares	(101,483)
Ending balance | shares	767,581
Weighted Average Grant Date Fair Value
Beginning balance | $ / shares	$ 16.04
Granted | $ / shares	28.46
Vested (1) | $ / shares	13.75
Forfeited | $ / shares	19.05
Ending balance | $ / shares	$ 21.11
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		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Payment Arrangement, Expense	$ 7,100,000	$ 4,800,000	$ 25,600,000	$ 12,400,000
SSARs
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	0		0
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	3,300,000		$ 3,300,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition			1 year 4 months 24 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	23,400,000		$ 23,400,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition			1 year 9 months 18 days
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 11,900,000		$ 11,900,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition			1 year 4 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		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Reconciliation of information used in computing basic and diluted earnings per share [Abstract]
Earnings (loss) from continuing operations	$ 27.7	$ 5.6	$ 57.6	$ (26.7)
Earnings from discontinued operations, net	0	0	0.2	3.7
Net earnings (loss)	$ 27.7	$ 5.6	$ 57.8	$ (23)
Basic earnings (loss) per common share:
Earnings (loss) from continuing operations, per basic share	$ 0.30	$ 0.06	$ 0.62	$ (0.29)
Earnings from discontinued operations, per basic share	0	0	0.01	0.04
Net earnings (loss) per share, basic	$ 0.30	$ 0.06	$ 0.63	$ (0.25)
Weighted average shares outstanding	92,189,329	91,688,765	92,315,146	91,707,702
Diluted earnings (loss) per common share:
Earnings (loss) from continuing operations, per diluted share	$ 0.29	$ 0.06	$ 0.61	$ (0.29)
Loss from discontinued operations, net	0	0	0	0.04
Net earnings (loss) per share, diluted	$ 0.29	$ 0.06	$ 0.61	$ (0.25)
Diluted (in shares)	94,143,034	92,473,318	94,780,940	91,707,702
Weighted average number of anti-dilutive shares excluded from the calculation (in shares)	1,129,231	4,559,131	1,299,454	5,102,219

Segment Information (Details)

Segment Information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021USD ($)	Sep. 30, 2020USD ($)	Sep. 30, 2021USD ($)segments	Sep. 30, 2020USD ($)	Dec. 31, 2020USD ($)
Segment Reporting Information
Billed Contracts Receivable	$ 120.3		$ 120.3		$ 123.8
Number of reportable segments | segments			2
Assets	1,723.2		$ 1,723.2		1,654.9
Revenues	233	$ 205.8	633.8	$ 521.1
Reconciliation of Net Earnings from Segments [Abstract]
Interest expense, net	4.2	4.7	12.3	12.5
Earnings (loss) before income taxes and discontinued operations	32.3	7.9	66.3	(21.1)
Provision for income taxes	4.6	2.3	8.7	5.6
Earnings (loss) from continuing operations	27.7	5.6	57.6	(26.7)
Asia
Segment Reporting Information
Revenues	163.4	151.7	452	368.3
United States
Segment Reporting Information
Revenues	42.2	28.8	109.3	86.8
Europe
Segment Reporting Information
Revenues	24.6	23.1	65.4	59.8
Other Americas
Segment Reporting Information
Revenues	1.6	1.3	3.9	2.8
Other Geographical Locations
Segment Reporting Information
Revenues	1.2	0.9	3.2	3.4
Operating Segments
Reconciliation of Net Earnings from Segments [Abstract]
Earnings (loss) before interest and income taxes	50.6	25.8	123.3	25.7
Operating Segments | Audio
Segment Reporting Information
Assets	1,461.7		1,461.7		1,470.4
Revenues	177.7	164.8	490.6	389.4
Reconciliation of Net Earnings from Segments [Abstract]
Earnings (loss) before interest and income taxes	36.6	17.8	95	(0.5)
Operating Segments | Precision Devices
Segment Reporting Information
Assets	257.4		257.4		179.2
Revenues	55.3	41	143.2	131.7
Reconciliation of Net Earnings from Segments [Abstract]
Earnings (loss) before interest and income taxes	14	8	28.3	26.2
Corporate, Non-Segment [Member]
Segment Reporting Information
Assets	4.1		4.1		$ 5.3
Reconciliation of Net Earnings from Segments [Abstract]
Corporate expense / other	14.1	13.2	44.7	34.3
Interest expense, net	$ 4.2	$ 4.7	$ 12.3	$ 12.5

Unusual or Infrequently Occurri

Unusual or Infrequently Occurring Items (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Jun. 30, 2020
Impairments [Line Items]
Asset Impairment Charges	$ 4	$ 7.6	$ 4	$ 7.6
Operating Lease, Right-of-Use Asset	17		$ 17		$ 23.3
Mountain View, California
Impairments [Line Items]
Asset Impairment Charges	3.2	5.4
Santa Clara, California [Member]
Impairments [Line Items]
Asset Impairment Charges	$ 0.8	$ 2.2
Santa Clara, California [Member]
Impairments [Line Items]
Operating Lease, Liability						$ 4
Operating Lease, Right-of-Use Asset						$ 2.4

Subsequent Events (Details)

Subsequent Events (Details) - Subsequent Event - Convertible Notes Due Twenty Twenty One - Convertible Debt shares in Millions, $ in Millions	Nov. 01, 2021USD ($)shares
Subsequent Event [Line Items]
Debt Conversion, Converted Instrument, Shares Issued	0.4
Repayments of Convertible Debt | $	$ 172.5
Proceeds from convertible note hedges, in shares	0.4