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Note 8 - Goodwill and Intangible Assets - Summary of Changes in Goodwill (Details) $ in Millions	9 Months Ended
	Sep. 30, 2021 USD ($)
Goodwill	$ 4,108.1
Acquisitions and purchase of controlling interest	61.0
Purchase accounting reclassifications	1.1
Current period adjustment (1)	0.0	[1]
Foreign currency translation adjustment	(40.7)
Goodwill	4,129.5
Insurance [Member]
Goodwill	1,208.6
Acquisitions and purchase of controlling interest	40.6
Purchase accounting reclassifications	1.1
Current period adjustment (1)	15.8	[1]
Foreign currency translation adjustment	(7.1)
Goodwill	1,259.0
Energy and Specialized Markets [Member]
Goodwill	2,423.6
Acquisitions and purchase of controlling interest	20.4
Purchase accounting reclassifications	0.0
Current period adjustment (1)	(15.8)	[1]
Foreign currency translation adjustment	(33.1)
Goodwill	2,395.1
Financial Services [Member]
Goodwill	475.9
Acquisitions and purchase of controlling interest	0.0
Purchase accounting reclassifications	0.0
Current period adjustment (1)	0.0	[1]
Foreign currency translation adjustment	(0.5)
Goodwill	$ 475.4
[1] Of which $15.8 million relates to a segment reclassification, refer to Note 14. Segment Reporting

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