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Segment Information (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) segments	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Segment Reporting Information
Billed Contracts Receivable	$ 108.2		$ 108.2		$ 123.8
Number of reportable segments | segments			2
Assets	1,681.9		$ 1,681.9		1,654.9
Revenues	199.8	$ 152.2	400.8	$ 315.3
Reconciliation of Net Earnings from Segments [Abstract]
Interest expense, net	4.1	4.1	8.1	7.8
Earnings (loss) before income taxes and discontinued operations	18.8	(18.4)	34.0	(29.0)
Provision for income taxes	1.4	1.1	4.1	3.3
Earnings (loss) from continuing operations	17.4	(19.5)	29.9	(32.3)
Asia
Segment Reporting Information
Revenues	140.5	106.9	288.6	216.6
United States
Segment Reporting Information
Revenues	35.6	28.7	67.1	58.0
Europe
Segment Reporting Information
Revenues	21.6	14.3	40.8	36.7
Other Americas
Segment Reporting Information
Revenues	1.1	0.9	2.3	1.5
Other Geographical Locations
Segment Reporting Information
Revenues	1.0	1.4	2.0	2.5
Operating Segments
Reconciliation of Net Earnings from Segments [Abstract]
Earnings (loss) before interest and income taxes	37.8	(1.1)	72.7	(0.1)
Operating Segments | Audio
Segment Reporting Information
Assets	1,428.2		1,428.2		1,470.4
Revenues	149.8	104.5	312.9	224.6
Reconciliation of Net Earnings from Segments [Abstract]
Earnings (loss) before interest and income taxes	28.0	(12.2)	58.4	(18.3)
Operating Segments | Precision Devices
Segment Reporting Information
Assets	249.4		249.4		179.2
Revenues	50.0	47.7	87.9	90.7
Reconciliation of Net Earnings from Segments [Abstract]
Earnings (loss) before interest and income taxes	9.8	11.1	14.3	18.2
Corporate, Non-Segment [Member]
Segment Reporting Information
Assets	4.3		4.3		$ 5.3
Reconciliation of Net Earnings from Segments [Abstract]
Corporate expense / other	14.9	13.2	30.6	21.1
Interest expense, net	$ 4.1	$ 4.1	$ 8.1	$ 7.8

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