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Note 3 - Revenues - Disaggregated Revenues (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Revenues $ 702.7 $ 652.7 $ 2,071.2 $ 1,930.3
UNITED STATES        
Revenues 537.6 515.9 1,584.2 1,489.8
UNITED KINGDOM        
Revenues 46.2 42.0 136.0 130.5
Other Countries [Member]        
Revenues 118.9 94.8 351.0 310.0
Insurance [Member]        
Revenues 498.6 469.0 1,474.4 1,393.5
Insurance [Member] | Underwriting and Rating [Member]        
Revenues 347.9 312.5 1,035.5 933.1
Insurance [Member] | Claims [Member]        
Revenues 150.7 156.5 438.9 460.4
Energy and Specialized Markets [Member]        
Revenues 163.8 140.3 478.2 406.1
Financial Services [Member]        
Revenues $ 40.3 $ 43.4 $ 118.6 $ 130.7