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Note 8 - Goodwill and Intangible Assets - Summary of Changes in Goodwill (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2022
USD ($)
Goodwill $ 4,331.2
Acquisitions and purchases of controlling interests 289.8 [1]
Purchase accounting reclassifications 0.2
Dispositions(2) (589.7) [2]
Impairment charge (1.7)
Foreign currency translation adjustment (374.2)
Goodwill 3,655.6
Insurance [Member]  
Goodwill 1,454.8
Acquisitions and purchases of controlling interests 289.8 [1]
Purchase accounting reclassifications (0.5)
Dispositions(2) 0.0 [2]
Impairment charge 0.0
Foreign currency translation adjustment (107.8)
Goodwill 1,636.3
Energy and Specialized Markets [Member]  
Goodwill 2,401.0
Acquisitions and purchases of controlling interests 0.0 [1]
Purchase accounting reclassifications 0.7
Dispositions(2) (116.5) [2]
Impairment charge 0.0
Foreign currency translation adjustment (265.9)
Goodwill 2,019.3
Financial Services [Member]  
Goodwill 475.4
Acquisitions and purchases of controlling interests 0.0 [1]
Purchase accounting reclassifications 0.0
Dispositions(2) (473.2) [2]
Impairment charge (1.7)
Foreign currency translation adjustment (0.5)
Goodwill $ 0.0
[1] See Note 6. Acquisitions for more information.
[2] See Note 7. Dispositions for more information.