Note 8 - Goodwill and Intangible Assets - Summary of Changes in Goodwill (Details) $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($)
Goodwill	$ 1,676.0
Goodwill	1,705.5
Insurance [Member]
Goodwill	1,676.0
Acquisitions(1)	18.3	[1]
Purchase accounting reclassifications	(0.1)
Foreign currency translation adjustment	11.3
Goodwill	$ 1,705.5

[1] This adjustment relates to a segment reclassification; refer to Note 19. Segment Reporting