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Business Segments, Currencies (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Schedule of Significant Currencies [Line Items] |  |  |
Document Period End Date | Dec. 31, 2021 |  |
Revenues | $ 19,367.0 | $ 16,589.9 | $ 17,983.2
Total Assets | 15,505.0 | 14,316.5 |
United States dollar [Member] |  |  |
Schedule of Significant Currencies [Line Items] |  |  |
Revenues | 11,283.1 | 9,457.8 | 10,054.9
British pound [Member] |  |  |
Schedule of Significant Currencies [Line Items] |  |  |
Revenues | 1,626.6 | 1,341.1 | 1,514.8
Euro [Member] |  |  |
Schedule of Significant Currencies [Line Items] |  |  |
Revenues | 1,393.3 | 1,350.6 | 1,507.7
Australian dollar [Member] |  |  |
Schedule of Significant Currencies [Line Items] |  |  |
Revenues | 1,118.7 | 876.1 | 924.5
Hong Kong dollar [Member] |  |  |
Schedule of Significant Currencies [Line Items] |  |  |
Revenues | 545.6 | 512.2 | 533.8
Chinese yuan [Member] |  |  |
Schedule of Significant Currencies [Line Items] |  |  |
Revenues | 539.1 | 473.1 | 505.9
Canada, Dollars |  |  |
Schedule of Significant Currencies [Line Items] |  |  |
Revenues | 508.3 | 432.6 | 435.5
Indian rupee [Member] |  |  |
Schedule of Significant Currencies [Line Items] |  |  |
Revenues | 508.2 | 524.5 | 651.8
Singapore dollar [Member] |  |  |
Schedule of Significant Currencies [Line Items] |  |  |
Revenues | 327.4 | 246.6 | 309.2
Japanese yen [Member] |  |  |
Schedule of Significant Currencies [Line Items] |  |  |
Revenues | 256.8 | 257.9 | 349.4
Other currencies [Member] |  |  |
Schedule of Significant Currencies [Line Items] |  |  |
Revenues | $ 1,259.9 | $ 1,117.4 | $ 1,195.7

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