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Note 6 - Revenues - Disaggregated Revenues (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Revenues $ 2,681.4 $ 2,497.0 $ 2,462.5
UNITED STATES      
Revenues 2,238.3 2,120.1 2,057.7
UNITED KINGDOM      
Revenues 190.1 169.5 169.0
Other Countries [Member]      
Revenues 253.0 207.4 235.8
Specialized Markets [Member]      
Revenues 0.0 22.4 112.8
Insurance [Member]      
Revenues 2,681.4 2,437.0 2,206.9
Insurance [Member] | Underwriting [Member]      
Revenues 1,892.7 1,734.5 1,555.1
Insurance [Member] | Claims [Member]      
Revenues 788.7 702.5 651.8
Financial Services [Member]      
Revenues $ 0.0 $ 37.6 $ 142.8