Note 10 - Derivatives - Effect of Derivative Instruments on Consolidated Statements of Earnings (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Net Sales		$ 263.3	$ 252.1
Interest Income		0.7	0.9
Net Foreign Currency Transaction Gain (Loss)		0.5	(4.1)
Net gain recognized in Other Comprehensive Loss, net of tax(a)		0.0	3.7
Net gain reclassified from Accumulated Other Comprehensive Loss into income, net of tax, effective portion to Interest Income		263.3	252.1
Net gain reclassified from Accumulated Other Comprehensive Loss into income, net of tax, effective portion to Net Foreign Currency Transaction Gain		0.7	0.9
Net gain reclassified from Accumulated Other Comprehensive Loss into income, net of tax, effective portion to Net Foreign Currency Transaction Loss		0.5	(4.1)
Sales [Member]
Amount of gain (loss) on cash flow hedge activity		(0.1)	0.0
Interest Income [Member]
Amount of gain (loss) on cash flow hedge activity		0.6	0.7
Foreign Currency Gain (Loss) [Member]
Amount of gain (loss) on cash flow hedge activity		7.3	2.7
Foreign Exchange Option [Member]
Net gain recognized in income(b)	[1]	2.1	0.0
Foreign Exchange Option [Member] | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest [Member]
Net gain recognized in Other Comprehensive Loss, net of tax(a)	[2]	6.0	0.3
Foreign Exchange Option [Member] | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Net Sales		0.4
Interest Income		5.6	0.0
Net Foreign Currency Transaction Gain (Loss)			0.0
Net gain reclassified from Accumulated Other Comprehensive Loss into income, net of tax, effective portion to Interest Income		0.4
Net gain reclassified from Accumulated Other Comprehensive Loss into income, net of tax, effective portion to Net Foreign Currency Transaction Gain		$ 5.6	0.0
Net gain reclassified from Accumulated Other Comprehensive Loss into income, net of tax, effective portion to Net Foreign Currency Transaction Loss			0.0
Foreign Exchange Forward [Member]
Net gain recognized in income(b)	[1]		2.2
Foreign Exchange Forward [Member] | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest [Member]
Net gain recognized in Other Comprehensive Loss, net of tax(a)	[2]		6.0
Foreign Exchange Forward [Member] | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Interest Income			0.5
Net Foreign Currency Transaction Gain (Loss)			2.1
Net gain reclassified from Accumulated Other Comprehensive Loss into income, net of tax, effective portion to Net Foreign Currency Transaction Gain			0.5
Net gain reclassified from Accumulated Other Comprehensive Loss into income, net of tax, effective portion to Net Foreign Currency Transaction Loss			$ 2.1

[1] Classified in Net Foreign Currency Transaction Gain (Loss).

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