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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 |

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