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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 |

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