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Consolidated Statements of Comprehensive Income - USD ($)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Statement [Abstract]      
Revenue Before Reimbursements $ 11,045.6 $ 8,900.1 $ 10,030.6
Reimbursement Revenues 8,321.4 7,689.8 7,952.6
Revenue: 19,367.0 16,589.9 17,983.2
Operating expenses:      
Compensation and benefits 6,819.9 5,268.8 5,812.7
Operating, administrative and other 2,880.0 2,703.4 3,115.7
Cost of Reimbursable Expenses 8,321.4 7,689.8 7,952.6
Depreciation and amortization 217.5 226.4 202.4
Restructuring and acquisition charges 84.7 142.4 184.4
Total operating expenses 18,323.5 16,030.8 17,267.8
Operating income 1,043.5 559.1 715.4
Interest expense, net of interest income 40.1 52.8 56.4
Equity earnings 209.4 8.0 36.3
Other Income 10.8 15.3 2.3
Income before income taxes and noncontrolling interest 1,223.6 529.6 697.6
Provision for income taxes 264.3 106.9 159.7
Net income 959.3 422.7 537.9
Net (loss) income attributable to noncontrolling interest (2.3) 20.2 2.6
Net income attributable to the Company 961.6 402.5 535.3
Dividends on unvested common stock, net of tax benefit 0.0 0.0 0.9
Net income attributable to common shareholders $ 961.6 $ 402.5 $ 534.4
Basic earnings per common share (in dollars per share) $ 18.89 $ 7.79 $ 10.98
Basic weighted average shares outstanding (in shares) 50,917 51,683 48,647
Diluted earnings per common share (in dollars per share) $ 18.47 $ 7.70 $ 10.87
Diluted weighted average shares outstanding (in shares) 52,071 52,282 49,154
Other comprehensive income (loss):      
Net income attributable to the Company $ 961.6 $ 402.5 $ 535.3
Change in pension liabilities, net of tax 38.5 (9.2) (14.6)
Foreign currency translation adjustments (56.7) 59.8 43.0
Comprehensive income attributable to the Company $ 943.4 $ 453.1 $ 563.7