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Results by Quarter (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract] |  |  |
Net revenue | $ 9,107.9 | $ 8,064.5 | $ 8,625.1
Billable expenses | 1,132.8 | 996.5 | 1,596.2
Total revenue | 10,240.7 | 9,061.0 | 10,221.3
Salaries and related expenses | 5,975.4 | 5,345.0 | 5,568.8
Office and other direct expenses | 1,279.6 | 1,367.9 | 1,564.1
Billable expense | 1,132.8 | 996.5 | 1,596.2
Cost of services | 8,387.8 | 7,709.4 | 8,729.1
Depreciation and amortization | 283.8 | 290.6 | 278.5
Restructuring Charges | 10.6 | 413.8 | 33.9
Total operating expenses | 8,804.5 | 8,472.6 | 9,135.3
Operating Income (Loss) | 1,436.2 | 588.4 | 1,086.0
Net losses on sales of businesses | (19.4) | (67.0) | (43.4)
Tax Adjustments, Settlements, and Unusual Provisions | 0.0 | (136.2) | 0.0
Total (expenses) and other income | (214.1) | (227.1) | (207.7)
NET INCOME | $ 972.8 | $ 354.2 | $ 673.9
Earnings per share, Basic | $ 2.42 | $ 0.90 | $ 1.70
Earnings per share, Diluted | $ 2.39 | $ 0.89 | $ 1.68

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