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Note 12 - Goodwill and Intangible Assets - Summary of Changes in Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021		Dec. 31, 2020
Goodwill	$ 4,108.1		$ 3,864.3
Acquisitions and purchases of controlling interests	257.1		171.7
Purchase accounting reclassifications	(0.3)		(4.1)
Current period adjustment	0.0	[1]	1.9
Foreign currency translation adjustment	(33.7)		74.3
Goodwill	4,331.2		4,108.1
Insurance [Member]
Goodwill	1,208.6		998.8
Acquisitions and purchases of controlling interests	235.9		171.7
Purchase accounting reclassifications	(0.3)		2.1
Current period adjustment	15.8	[1]	21.4
Foreign currency translation adjustment	(5.2)		14.6
Goodwill	1,454.8		1,208.6
Energy and Specialized Markets [Member]
Goodwill	2,423.6		2,389.5
Acquisitions and purchases of controlling interests	21.2		0.0
Purchase accounting reclassifications	0.0		(6.0)
Current period adjustment	(15.8)	[1]	(19.5)
Foreign currency translation adjustment	(28.0)		59.6
Goodwill	2,401.0		2,423.6
Financial Services [Member]
Goodwill	475.9		476.0
Acquisitions and purchases of controlling interests	0.0		0.0
Purchase accounting reclassifications	0.0		(0.2)
Current period adjustment	0.0	[1]	0.0
Foreign currency translation adjustment	(0.5)		0.1
Goodwill	$ 475.4		$ 475.9
[1] This adjustment relates to a segment reclassification; refer to Note 19. Segment Reporting

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