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Business Segments, Currencies (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule of Significant Currencies [Line Items]      
Total segment revenue $ 7,932.4 $ 6,803.8 $ 5,965.7
Total Assets 8,014.5 7,629.4  
United States dollar [Member]      
Schedule of Significant Currencies [Line Items]      
Total segment revenue 3,251.8 2,948.5 2,536.4
Total Assets 4,357.3 4,615.3  
British pound [Member]      
Schedule of Significant Currencies [Line Items]      
Total segment revenue 1,302.7 1,007.3 915.5
Total Assets 1,209.5 1,005.3  
Euro [Member]      
Schedule of Significant Currencies [Line Items]      
Total segment revenue 1,084.5 880.7 748.7
Total Assets 784.4 581.0  
Australian dollar [Member]      
Schedule of Significant Currencies [Line Items]      
Total segment revenue 412.4 345.9 303.0
Total Assets 264.1 215.5  
Hong Kong dollar [Member]      
Schedule of Significant Currencies [Line Items]      
Total segment revenue 268.8 246.9 186.7
Total Assets 184.0 161.1  
Chinese yuan [Member]      
Schedule of Significant Currencies [Line Items]      
Total segment revenue 261.2 196.2 178.6
Total Assets 158.2 147.2  
Indian rupee [Member]      
Schedule of Significant Currencies [Line Items]      
Total segment revenue 259.4 216.2 189.4
Total Assets 231.0 182.0  
Japanese yen [Member]      
Schedule of Significant Currencies [Line Items]      
Total segment revenue 200.3 199.1 170.0
Total Assets 85.4 89.5  
Singapore dollar [Member]      
Schedule of Significant Currencies [Line Items]      
Total segment revenue 147.0 104.0 123.2
Total Assets 160.3 131.8  
Other currencies [Member]      
Schedule of Significant Currencies [Line Items]      
Total segment revenue 744.3 659.0 $ 614.2
Total Assets $ 580.3 $ 500.7