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Income Taxes - Income before Tax, Domestic and Foreign (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]      
Unrecognized Tax Benefits, Income Tax Penalties Expense $ 0.0 $ 0.0 $ 0.0
Document Fiscal Year Focus 2021    
Components of Earnings before Income Tax [Abstract]      
Domestic $ 15.5 (26.2) (48.3)
Foreign 89.1 37.5 114.6
(Loss) earnings before income taxes [1] 104.6 11.3 66.3
Unrecognized Tax Benefits, Interest on Income Taxes Expense 0.0 0.0 0.0
Unrecognized Tax Benefits, Income Tax Penalties Accrued 0.3 $ 0.3 $ 0.3
Unrecognized Tax Benefits that Would Impact Effective Tax Rate $ 2.0    
[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