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Consolidated Statements of Comprehensive Income - USD ($)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement [Abstract]      
Revenue $ 7,932.4 $ 6,803.8 $ 5,965.7
Operating expenses:      
Compensation and benefits 4,572.2 3,983.1 3,564.6
Operating, administrative and other 2,625.4 2,169.8 1,729.1
Depreciation and amortization 167.2 141.8 108.1
Restructuring and acquisition charges 30.7 68.5 34.1
Total operating expenses 7,395.5 6,363.2 5,435.9
Operating income 536.9 440.6 529.8
Interest expense, net of interest income 56.2 45.3 28.1
Equity earnings from real estate ventures 44.4 33.8 77.4
Other Income 0.0 13.3 0.0
Income before income taxes and noncontrolling interest 525.1 442.4 579.1
Provision for income taxes 267.8 108.0 132.8
Net income 257.3 334.4 446.3
Net income attributable to noncontrolling interest 3.1 16.2 7.6
Net income attributable to the Company 254.2 318.2 438.7
Dividends on unvested common stock, net of tax benefit 0.4 0.4 0.3
Net income attributable to common shareholders $ 253.8 $ 317.8 $ 438.4
Basic earnings per common share (in dollars per share) $ 5.60 $ 7.04 $ 9.75
Basic weighted average shares outstanding (in shares) 45,316 45,154 44,940
Diluted earnings per common share (in dollars per share) $ 5.55 $ 6.98 $ 9.65
Diluted weighted average shares outstanding (in shares) 45,758 45,528 45,415
Other comprehensive income (loss):      
Net income attributable to the Company $ 254.2 $ 318.2 $ 438.7
Change in pension liabilities, net of tax 8.2 (32.9) 27.6
Foreign currency translation adjustments 201.1 (181.9) (163.7)
Comprehensive income attributable to the Company $ 463.5 $ 103.4 $ 302.6