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Note 8 - Goodwill and Intangible Assets - Summary of Changes in Goodwill (Details) $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($)
Goodwill	$ 3,864.3
Current year acquisition	99.9
Purchase accounting reclassifications	1.7
Current period adjustment (1)	1.9	[1]
Foreign currency translation	(42.9)
Goodwill	3,924.9
Insurance [Member]
Goodwill	998.8
Current year acquisition	99.9
Purchase accounting reclassifications	3.1
Current period adjustment (1)	21.4	[1]
Foreign currency translation	(9.6)
Goodwill	1,113.6
Energy and Specialized Markets [Member]
Goodwill	2,389.5
Current year acquisition	0.0
Purchase accounting reclassifications	(1.2)
Current period adjustment (1)	(19.5)	[1]
Foreign currency translation	(32.9)
Goodwill	2,335.9
Financial Services [Member]
Goodwill	476.0
Current year acquisition	0.0
Purchase accounting reclassifications	(0.2)
Current period adjustment (1)	0.0	[1]
Foreign currency translation	(0.4)
Goodwill	$ 475.4
[1] Of which $19.5 million relates to a segment reclassification, refer to Note 13. Segment Reporting

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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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