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Acquisitions - Consideration Transferred (Details) - USD ($) $ in Millions			1 Months Ended	3 Months Ended	12 Months Ended
	Sep. 14, 2018	May 09, 2018	Oct. 31, 2019	Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Echelon Corporation [Member]
Business Combination, Consideration Transferred [Abstract]
Cash consideration	$ 44.1
Aggregate consideration	$ 44.1
S3 Asic Semiconductors Limited [Member]
Business Combination, Consideration Transferred [Abstract]
Aggregate consideration		$ 35.0
Earn-out		$ 15.0
Fair Value of earn-out liability				$ 2.0		$ 10.5
Liability reduction				$ 0.9	$ 0.3
Payment of contingent liability			$ 7.2