Note 11 - Derivatives - Effect of Derivative Instruments on Consolidated Statements of Earnings (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net Sales		$ 1,001.0	$ 1,137.6	$ 1,123.5
Interest Income		3.3	3.3	3.0
Net Foreign Currency Transaction Losses		(5.3)	(0.7)	(1.1)
Net gain (loss) reclassified from Accumulated Other Comprehensive Loss into earnings, net of tax		1,001.0	1,137.6	1,123.5
Net gain (loss) reclassified from Accumulated Other Comprehensive Loss into earnings, net of tax		3.3	3.3	3.0
Net gain (loss) reclassified from Accumulated Other Comprehensive Loss into earnings, net of tax		(5.3)	(0.7)	(1.1)
Foreign Exchange Option [Member]
Net loss recognized in earnings(2)	[1]	0.0	0.0	0.0
Foreign Exchange Option [Member] | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest [Member]
Net gain (loss) recognized in Other Comprehensive Income (Loss), net of tax(1)	[2]	(0.1)	(0.3)	0.1
Foreign Exchange Option [Member] | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Net Sales		0.0	0.0	(0.1)
Interest Income		0.0	0.0	0.0
Net Foreign Currency Transaction Losses		0.0	0.0	0.0
Net gain (loss) reclassified from Accumulated Other Comprehensive Loss into earnings, net of tax		0.0	0.0	(0.1)
Net gain (loss) reclassified from Accumulated Other Comprehensive Loss into earnings, net of tax		0.0	0.0	0.0
Net gain (loss) reclassified from Accumulated Other Comprehensive Loss into earnings, net of tax		0.0	0.0	0.0
Foreign Exchange Forward [Member]
Net loss recognized in earnings(2)	[1]	(5.0)	(1.3)	(2.5)
Foreign Exchange Forward [Member] | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest [Member]
Net gain (loss) recognized in Other Comprehensive Income (Loss), net of tax(1)	[2]	(7.4)	8.6	9.0
Foreign Exchange Forward [Member] | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Net Sales		(0.1)	0.0	0.0
Interest Income		2.0	2.2	1.9
Net Foreign Currency Transaction Losses		(11.6)	2.6	6.4
Net gain (loss) reclassified from Accumulated Other Comprehensive Loss into earnings, net of tax		(0.1)	0.0	0.0
Net gain (loss) reclassified from Accumulated Other Comprehensive Loss into earnings, net of tax		2.0	2.2	1.9
Net gain (loss) reclassified from Accumulated Other Comprehensive Loss into earnings, net of tax		(11.6)	2.6	$ 6.4
Sales [Member]
Amount of gain (loss) on cash flow hedge activity		(0.2)	(0.1)
Interest Income [Member]
Amount of gain (loss) on cash flow hedge activity		2.7	2.9
Foreign Currency Gain (Loss) [Member]
Amount of gain (loss) on cash flow hedge activity		$ (15.0)	$ 3.4

[1] Classified in Net Foreign Currency Transaction Losses.

[2] Net change in the fair value of the effective portion classified in Other Comprehensive (Loss) Income.