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Note 3 - Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net sales	$ 272.0	$ 261.9	$ 814.4	$ 728.0
Sales Channel, Directly to Consumer [Member]
Net sales	175.4	177.3	517.3	488.2
Sales Channel, Through Intermediary [Member]
Net sales	96.6	84.6	297.1	239.8
Equipment Sales [Member]
Net sales	168.6	167.6	506.6	456.3
Parts and Consumables [Member]
Net sales	62.8	52.7	187.4	150.2
Specialty Service Coatings [Member]
Net sales	0.0	5.3	1.5	16.6
Service and Other [Member]
Net sales	40.6	36.3	118.9	104.9
Americas [Member]
Net sales	166.7	167.7	491.7	466.6
EMEA [Member]
Net sales	80.7	69.5	246.8	196.3
Asia Pacific [Member]
Net sales	$ 24.6	$ 24.7	$ 75.9	$ 65.1

X

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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