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Business Segments, Currencies (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Schedule of Significant Currencies [Line Items]      
Revenues $ 20,760.8 $ 20,862.1 $ 19,367.0
United States dollar [Member]      
Schedule of Significant Currencies [Line Items]      
Revenues 12,258.9 12,375.9 11,283.1
British pound [Member]      
Schedule of Significant Currencies [Line Items]      
Revenues 1,640.0 1,575.6 1,626.6
Euro [Member]      
Schedule of Significant Currencies [Line Items]      
Revenues 1,436.1 1,535.6 1,393.3
Australian dollar [Member]      
Schedule of Significant Currencies [Line Items]      
Revenues 1,036.9 1,183.0 1,118.7
Indian rupee [Member]      
Schedule of Significant Currencies [Line Items]      
Revenues 661.4 591.0 508.2
Canada, Dollars      
Schedule of Significant Currencies [Line Items]      
Revenues 613.8 593.8 508.3
Hong Kong dollar [Member]      
Schedule of Significant Currencies [Line Items]      
Revenues 544.8 532.3 545.6
Chinese yuan [Member]      
Schedule of Significant Currencies [Line Items]      
Revenues 480.9 506.0 539.1
Singapore dollar [Member]      
Schedule of Significant Currencies [Line Items]      
Revenues 425.4 368.4 327.4
Japanese yen [Member]      
Schedule of Significant Currencies [Line Items]      
Revenues 286.6 233.8 256.8
Other currencies [Member]      
Schedule of Significant Currencies [Line Items]      
Revenues $ 1,376.0 $ 1,366.7 $ 1,259.9