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Consolidated Statements of Comprehensive Income - USD ($)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income Statement [Abstract]      
Revenue $ 20,862.1 $ 19,367.0 $ 16,589.9
Operating expenses:      
Compensation and benefits 10,010.8 9,535.5 7,708.1
Operating, administrative and other 9,650.3 8,485.8 7,953.9
Depreciation and amortization 228.1 217.5 226.4
Restructuring and acquisition charges 104.8 84.7 142.4
Total operating expenses 19,994.0 18,323.5 16,030.8
Operating income 868.1 1,043.5 559.1
Interest expense, net of interest income 75.2 40.1 52.8
Equity earnings 51.0 209.4 8.0
Other Income 150.3 10.8 15.3
Income before income taxes and noncontrolling interest 994.2 1,223.6 529.6
Provision for income taxes 200.8 264.3 106.9
Net income 793.4 959.3 422.7
Net income (loss) attributable to noncontrolling interest 138.9 (2.3) 20.2
Net income attributable to the Company 654.5 961.6 402.5
Net income attributable to common shareholders $ 654.5 $ 961.6 $ 402.5
Basic earnings per common share (in dollars per share) $ 13.51 $ 18.89 $ 7.79
Basic weighted average shares outstanding (in shares) 48,453 50,917 51,683
Diluted earnings per common share (in dollars per share) $ 13.27 $ 18.47 $ 7.70
Diluted weighted average shares outstanding (in shares) 49,341 52,071 52,282
Other comprehensive income (loss):      
Net income attributable to the Company $ 654.5 $ 961.6 $ 402.5
Change in pension liabilities, net of tax (21.5) 38.5 (9.2)
Foreign currency translation adjustments (231.3) (56.7) 59.8
Comprehensive income attributable to common shareholders $ 401.7 $ 943.4 $ 453.1