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Note 6 - Revenues - Disaggregated Revenues (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Revenues $ 2,998.6 $ 2,784.6 $ 2,607.1
UNITED STATES      
Revenues 2,285.5 2,133.6 2,005.6
UNITED KINGDOM      
Revenues 204.4 181.6 177.3
Other Countries [Member]      
Revenues 508.7 469.4 424.2
Insurance [Member]      
Revenues 2,206.9 2,008.7 1,885.4
Insurance [Member] | Underwriting and Rating [Member]      
Revenues 1,555.1 1,413.0 1,274.5
Insurance [Member] | Claims [Member]      
Revenues 651.8 595.7 610.9
Energy and Specialized Markets [Member]      
Revenues 648.9 619.2 543.7
Financial Services [Member]      
Revenues $ 142.8 $ 156.7 $ 178.0