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Acquisitions (Details) - USD ($) $ / shares in Units, $ in Millions			2 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended	33 Months Ended
	Jan. 19, 2018	Jan. 11, 2017	Mar. 31, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2019
Business Acquisition
Goodwill				$ 887.9		$ 887.9		$ 884.9
Revenue, Net				188.4	$ 164.4	366.9	$ 332.7
Earnings (loss) from continuing operations				$ 4.4	$ (30.9)	$ 4.0	$ (35.9)
Earnings (loss) from continuing operations, per basic share				$ 0.05	$ (0.35)	$ 0.04	$ (0.40)
Earnings (loss) from continuing operations, per diluted share				$ 0.05	$ (0.35)	$ 0.04	$ (0.40)
Compex Corporation
Business Acquisition
Payments to Acquire Businesses, Gross	$ 16.0
Business Combination, Consideration Transferred	18.7
Business Combination, Consideration Transferred, Other	0.6
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual			$ 5.8
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual			$ 1.0
Cash	0.2
Receivables	1.7
Inventories	2.1
Property, plant, and equipment	2.0
Business Combination, Contingent Consideration, Asset, Noncurrent	0.2
Goodwill	3.0
Assumed current liabilities	(0.2)
Total purchase price	18.7
Business Acquisition, Goodwill, Expected Tax Deductible Amount	0.0
Business Acquisition, Pro Forma Revenue					$ 167.5	$ 367.5	$ 338.7
Business Acquisition, Pro Forma Net Income (Loss)					$ (30.3)	$ 4.7	$ (34.7)
Business Acquisition, Pro Forma Earnings Per Share, Basic					$ (0.34)	$ 0.05	$ (0.39)
Business Acquisition, Pro Forma Earnings Per Share, Diluted					$ (0.34)	$ 0.05	$ (0.39)
17Q1 Capacitor Acquisition
Business Acquisition
Payments to Acquire Businesses, Gross		$ 3.7		$ 0.2				2.5
Scenario, Forecast | 17Q1 Capacitor Acquisition
Business Acquisition
Payments to Acquire Businesses, Gross									$ 1.0
Customer relationships | Compex Corporation
Business Acquisition
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 7.3
Finite-Lived Intangible Asset, Useful Life	10 years
Unpatented technologies | Compex Corporation
Business Acquisition
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 2.0
Finite-Lived Intangible Asset, Useful Life	8 years
Trademarks | Compex Corporation
Business Acquisition
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$ 0.4
Finite-Lived Intangible Asset, Useful Life	5 years
Other liabilities | Compex Corporation
Business Acquisition
Payments to Acquire Businesses, Gross	$ 1.0
Precision Devices
Business Acquisition
Goodwill				28.0		$ 28.0		$ 25.0
Goodwill, Translation and Purchase Accounting Adjustments				$ 0.1

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