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Business Segments, Currencies (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule of Significant Currencies [Line Items]      
Document Period End Date Dec. 31, 2020    
Revenues $ 16,589.9 $ 17,983.2 $ 16,318.4
Total Assets 14,316.5 13,672.6  
United States dollar [Member]      
Schedule of Significant Currencies [Line Items]      
Revenues 9,457.8 10,054.9 8,523.8
Euro [Member]      
Schedule of Significant Currencies [Line Items]      
Revenues 1,350.6 1,507.7 1,527.1
British pound [Member]      
Schedule of Significant Currencies [Line Items]      
Revenues 1,341.1 1,514.8 1,526.3
Australian dollar [Member]      
Schedule of Significant Currencies [Line Items]      
Revenues 876.1 924.5 916.7
Indian rupee [Member]      
Schedule of Significant Currencies [Line Items]      
Revenues 524.5 651.8 580.4
Chinese yuan [Member]      
Schedule of Significant Currencies [Line Items]      
Revenues 473.1 505.9 505.5
Hong Kong dollar [Member]      
Schedule of Significant Currencies [Line Items]      
Revenues 512.2 533.8 487.2
Singapore dollar [Member]      
Schedule of Significant Currencies [Line Items]      
Revenues 246.6 309.2 458.7
Canada, Dollars      
Schedule of Significant Currencies [Line Items]      
Revenues 432.6 435.5 390.5
Japanese yen [Member]      
Schedule of Significant Currencies [Line Items]      
Revenues 257.9 349.4 285.2
Other currencies [Member]      
Schedule of Significant Currencies [Line Items]      
Revenues $ 1,117.4 $ 1,195.7 $ 1,117.0