Acquisitions (Details) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended		6 Months Ended
	Dec. 20, 2019	Jan. 03, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Business Acquisition
Goodwill			$ 909.9		$ 909.9		$ 909.9
Business Acquisition, Pro Forma Net Income (Loss)				$ 3.5		$ (1.5)
(Loss) earnings from continuing operations			$ (19.5)	$ 5.9	$ (32.3)	$ 3.2
Earnings (loss) from continuing operations, per basic share			$ (0.21)	$ 0.06	$ (0.35)	$ 0.04
Business Acquisition, Pro Forma Earnings Per Share, Basic				0.04		(0.02)
Earnings (loss) from continuing operations, per diluted share			$ (0.21)	0.06	$ (0.35)	0.03
Business Acquisition, Pro Forma Earnings Per Share, Diluted				$ 0.04		$ (0.02)
ASIC Design Business
Business Acquisition
Payments to Acquire Businesses, Gross	$ 57.9
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	0.6
Goodwill	18.8
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	(0.1)
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	$ 57.9
Finite-Lived Intangible Asset, Useful Life	6 years
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 1.6
Compex Corporation
Business Acquisition
Payments to Acquire Businesses, Gross		$ 11.1
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual						$ 4.0
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual						$ 0.2
-100000 | ASIC Design Business
Business Acquisition
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	33.3
In Process Research and Development [Member] | ASIC Design Business
Business Acquisition
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 3.7