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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 |

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