Note 7 - Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Details) $ in Millions	6 Months Ended
	Jun. 30, 2022 USD ($)
Balance	$ 233.9
Balance, accumulated impairment losses	(40.8)
Balance, net	193.1
Foreign currency fluctuations	(16.7)
Foreign currency fluctuations, accumulated impairment losses	(3.9)
Foreign currency fluctuations, net	(12.8)
Balance	217.2
Balance, accumulated impairment losses	(36.9)
Balance, net	$ 180.3