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Note 3 - Revenues - Disaggregated Revenues (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Revenues $ 745.3 $ 759.0 $ 2,267.1 $ 2,232.6
UNITED STATES        
Revenues 579.8 568.4 1,764.7 1,698.3
UNITED KINGDOM        
Revenues 50.2 53.4 154.4 152.1
Other Countries [Member]        
Revenues 115.3 137.2 348.0 382.2
Insurance [Member]        
Revenues 610.1 557.9 1,806.5 1,643.5
Insurance [Member] | Underwriting and Rating [Member]        
Revenues 436.2 390.5 1,290.0 1,156.0
Insurance [Member] | Claims [Member]        
Revenues 173.9 167.4 516.5 487.5
Energy and Specialized Markets [Member]        
Revenues 135.2 165.9 423.0 484.4
Financial Services [Member]        
Revenues $ 0.0 $ 35.2 $ 37.6 $ 104.7