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Business Segments, Currencies (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Schedule of Significant Currencies [Line Items]                      
Revenues $ 4,889.7 $ 3,969.8 $ 3,903.7 $ 3,555.2 $ 4,343.0 $ 3,522.2 $ 3,470.3 $ 3,117.7 $ 16,318.4 $ 14,453.2 $ 12,991.2
Total Assets 10,025.5       9,254.4       10,025.5 9,254.4  
United States dollar [Member]                      
Schedule of Significant Currencies [Line Items]                      
Revenues                 8,523.8 7,572.1 7,235.8
Total Assets 5,866.4       5,363.6       5,866.4 5,363.6  
Euro [Member]                      
Schedule of Significant Currencies [Line Items]                      
Revenues                 1,527.1 1,244.8 1,020.0
Total Assets 932.2       810.5       932.2 810.5  
British pound [Member]                      
Schedule of Significant Currencies [Line Items]                      
Revenues                 1,526.3 1,447.3 1,124.6
Total Assets 1,187.3       1,228.1       1,187.3 1,228.1  
Australian dollar [Member]                      
Schedule of Significant Currencies [Line Items]                      
Revenues                 916.7 909.7 820.0
Total Assets 291.6       331.8       291.6 331.8  
Indian rupee [Member]                      
Schedule of Significant Currencies [Line Items]                      
Revenues                 580.4 516.2 434.9
Total Assets 317.5       260.5       317.5 260.5  
Chinese yuan [Member]                      
Schedule of Significant Currencies [Line Items]                      
Revenues                 505.5 439.7 358.1
Total Assets 190.4       163.1       190.4 163.1  
Hong Kong dollar [Member]                      
Schedule of Significant Currencies [Line Items]                      
Revenues                 487.2 450.0 420.1
Total Assets 187.1       189.9       187.1 189.9  
Singapore dollar [Member]                      
Schedule of Significant Currencies [Line Items]                      
Revenues                 458.7 268.0 218.3
Total Assets 236.5       160.3       236.5 160.3  
Canada, Dollars                      
Schedule of Significant Currencies [Line Items]                      
Revenues                 390.5 333.4 300.4
Total Assets 172.0       127.4       172.0 127.4  
Japanese yen [Member]                      
Schedule of Significant Currencies [Line Items]                      
Revenues                 285.2 238.2 235.5
Total Assets 96.4       85.4       96.4 85.4  
Other currencies [Member]                      
Schedule of Significant Currencies [Line Items]                      
Revenues                 1,117.0 1,033.8 $ 823.5
Total Assets $ 548.1       $ 533.8       $ 548.1 $ 533.8