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Note 8 - Goodwill and Intangible Assets - Summary of Changes in Goodwill (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($)
Goodwill	$ 4,108.1
Acquisitions	20.9
Purchase accounting reclassifications	1.1
Current period adjustment (1)	0.0	[1]
Foreign currency translation adjustment	5.5
Goodwill	4,135.6
Insurance [Member]
Goodwill	1,208.6
Acquisitions	20.9
Purchase accounting reclassifications	1.1
Current period adjustment (1)	15.8	[1]
Foreign currency translation adjustment	3.1
Goodwill	1,249.5
Energy and Specialized Markets [Member]
Goodwill	2,423.6
Acquisitions	0.0
Purchase accounting reclassifications	0.0
Current period adjustment (1)	(15.8)	[1]
Foreign currency translation adjustment	2.6
Goodwill	2,410.4
Financial Services [Member]
Goodwill	475.9
Acquisitions	0.0
Purchase accounting reclassifications	0.0
Current period adjustment (1)	0.0	[1]
Foreign currency translation adjustment	(0.2)
Goodwill	$ 475.7
[1] Of which $15.8 million relates to a segment reclassification, refer to Note 14. Segment Reporting

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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