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Note 12 - Goodwill and Intangible Assets - Summary of Changes in Goodwill (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Goodwill		$ 3,864.3	$ 3,361.5
Acquisitions		171.7	453.5
Businesses held for sale and disposition			(8.6)
Purchase accounting reclassifications		(4.1)	(1.5)
Foreign currency translation adjustment		74.3	59.4
Current period adjustment (1)	[1]	1.9
Goodwill		4,108.1	3,864.3
Insurance [Member]
Goodwill		998.8	833.8
Acquisitions		171.7	161.0
Businesses held for sale and disposition			(7.9)
Purchase accounting reclassifications		2.1	(1.4)
Foreign currency translation adjustment		14.6	13.3
Current period adjustment (1)	[1]	21.4
Goodwill		1,208.6	998.8
Energy and Specialized Markets [Member]
Goodwill		2,389.5	2,054.7
Acquisitions		0.0	288.5
Businesses held for sale and disposition			0.0
Purchase accounting reclassifications		(6.0)	0.0
Foreign currency translation adjustment		59.6	46.3
Current period adjustment (1)	[1]	(19.5)
Goodwill		2,423.6	2,389.5
Financial Services [Member]
Goodwill		476.0	473.0
Acquisitions		0.0	4.0
Businesses held for sale and disposition			(0.7)
Purchase accounting reclassifications		(0.2)	(0.1)
Foreign currency translation adjustment		0.1	(0.2)
Current period adjustment (1)	[1]	0.0
Goodwill		$ 475.9	$ 476.0
[1] Of which $19.5 million relates to a segment reclassification, refer to Note 19. 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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