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Business Segments, Currencies (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule of Significant Currencies [Line Items]      
Total segment revenue $ 6,803.8 $ 5,965.7 $ 5,429.6
Total Assets 7,629.4 6,187.1  
United States dollar [Member]      
Schedule of Significant Currencies [Line Items]      
Total segment revenue 2,948.5 2,536.4 2,214.1
Total Assets 4,615.3 3,635.3  
British pound [Member]      
Schedule of Significant Currencies [Line Items]      
Total segment revenue 1,007.3 915.5 833.4
Total Assets 1,005.3 839.5  
Euro [Member]      
Schedule of Significant Currencies [Line Items]      
Total segment revenue 880.7 748.7 701.8
Total Assets 581.0 497.4  
Australian dollar [Member]      
Schedule of Significant Currencies [Line Items]      
Total segment revenue 345.9 303.0 303.1
Total Assets 215.5 212.1  
Hong Kong dollar [Member]      
Schedule of Significant Currencies [Line Items]      
Total segment revenue 246.9 186.7 170.5
Total Assets 161.1 129.0  
Indian rupee [Member]      
Schedule of Significant Currencies [Line Items]      
Total segment revenue 216.2 189.4 155.1
Total Assets 182.0 150.1  
Japanese yen [Member]      
Schedule of Significant Currencies [Line Items]      
Total segment revenue 199.1 170.0 155.1
Total Assets 89.5 53.1  
Chinese yuan [Member]      
Schedule of Significant Currencies [Line Items]      
Total segment revenue 196.2 178.6 169.2
Total Assets 147.2 107.2  
Singapore dollar [Member]      
Schedule of Significant Currencies [Line Items]      
Total segment revenue 104.0 123.2 157.7
Total Assets 131.8 123.1  
Other currencies [Member]      
Schedule of Significant Currencies [Line Items]      
Total segment revenue 659.0 614.2 $ 569.6
Total Assets $ 500.7 $ 440.3