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Segment Information - Information on Reportable Segments (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
segments
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Segment Reporting Information [Line Items]      
Document Fiscal Year Focus 2021    
Number of reportable segments | segments 2    
Reconciliation from Segment Totals to Consolidated [Abstract]      
Revenues $ 868.1 $ 764.3 $ 854.8
Reconciliation of Net Earnings from Segments [Abstract]      
Interest expense, net 14.2 16.4 14.5
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest [1] 104.6 11.3 66.3
(Benefit from) provision for income taxes (45.6) 8.4 16.6
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent 150.2 2.9 49.7
Reconciliation of Depreciation and Amortization [Abstract]      
Depreciation and amortization 62.5 60.6 54.4
Reconciliation of Research and Development Expense [Abstract]      
Research and development expenses 92.8 92.9 96.8
Operating segments      
Reconciliation of Net Earnings from Segments [Abstract]      
(Loss) earnings before interest and income taxes [1] 180.7 76.6 137.7
Reconciliation of Capital Expenditures [Abstract]      
Capital expenditures 48.6 31.9 41.2
Reconciliation of Research and Development Expense [Abstract]      
Research and development expenses 92.8 92.9 96.8
Operating segments | Audio      
Reconciliation from Segment Totals to Consolidated [Abstract]      
Revenues 667.0 591.2 682.8
Reconciliation of Net Earnings from Segments [Abstract]      
(Loss) earnings before interest and income taxes 137.0 44.9 107.3
Reconciliation of Depreciation and Amortization [Abstract]      
Depreciation and amortization 46.2 47.0 41.3
Reconciliation of Capital Expenditures [Abstract]      
Capital expenditures 40.8 21.9 24.0
Reconciliation of Research and Development Expense [Abstract]      
Research and development expenses 81.8 84.6 90.8
Operating segments | Precision Devices      
Reconciliation from Segment Totals to Consolidated [Abstract]      
Revenues 201.1 173.1 172.0
Reconciliation of Net Earnings from Segments [Abstract]      
(Loss) earnings before interest and income taxes 43.7 31.7 30.4
Reconciliation of Depreciation and Amortization [Abstract]      
Depreciation and amortization 13.3 10.5 9.9
Reconciliation of Capital Expenditures [Abstract]      
Capital expenditures 5.6 9.6 16.5
Reconciliation of Research and Development Expense [Abstract]      
Research and development expenses 10.5 6.7 5.8
Corporate, Non-Segment [Member]      
Reconciliation of Depreciation and Amortization [Abstract]      
Depreciation and amortization 3.0 3.1 3.2
Reconciliation of Capital Expenditures [Abstract]      
Capital expenditures 2.2 0.4 0.7
Reconciliation of Research and Development Expense [Abstract]      
Research and development expenses 0.5 1.6 0.2
Corporate Expense and Other $ 61.9 $ 48.9 $ 56.9
[1]
 Years Ended December 31,
(in millions)202120202019
Revenues:
Audio$667.0 $591.2 $682.8 
Precision Devices201.1 173.1 172.0 
Total revenues$868.1 $764.3 $854.8 
Earnings from continuing operations before interest and income taxes:
Audio$137.0 $44.9 $107.3 
Precision Devices43.7 31.7 30.4 
Total segments180.7 76.6 137.7 
Corporate expense / other61.9 48.9 56.9 
Interest expense, net14.2 16.4 14.5 
Earnings before income taxes and discontinued operations104.6 11.3 66.3 
 (Benefit from) provision for income taxes(45.6)8.4 16.6 
Earnings from continuing operations$150.2 $2.9 $49.7 
Depreciation and amortization:
Audio$46.2 $47.0 $41.3 
Precision Devices13.3 10.5 9.9 
Corporate3.0 3.1 3.2 
Total$62.5 $60.6 $54.4 
Capital expenditures:
Audio$40.8 $21.9 $24.0 
Precision Devices5.6 9.6 16.5 
Corporate2.2 0.4 0.7 
Total$48.6 $31.9 $41.2 
Research and development:
Audio$81.8 $84.6 $90.8 
Precision Devices10.5 6.7 5.8 
Corporate0.5 1.6 0.2 
Total$92.8 $92.9 $96.8