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Consolidated Statements of Comprehensive Income - USD ($)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Statement [Abstract]      
Revenue Before Reimbursements $ 9,089.5 $ 7,967.4 $ 6,910.6
Reimbursement Revenues 7,228.9 6,485.8 6,080.6
Revenue: 16,318.4 14,453.2 12,991.2
Operating expenses:      
Compensation and benefits 5,206.8 4,622.4 4,040.5
Operating, administrative and other 2,950.9 2,601.2 2,204.1
Cost of Reimbursable Expenses 7,228.9 6,485.8 6,080.6
Depreciation and amortization 186.1 167.2 141.8
Restructuring and acquisition charges 38.8 30.7 68.5
Total operating expenses 15,611.5 13,907.3 12,535.5
Operating income 706.9 545.9 455.7
Interest expense, net of interest income 51.1 56.2 45.3
Equity earnings from real estate ventures 32.8 44.4 33.8
Other Income 17.4 1.7 19.5
Income before income taxes and noncontrolling interest 706.0 535.8 463.7
Provision for income taxes 214.3 256.3 117.8
Net income 491.7 279.5 345.9
Net income attributable to noncontrolling interest 7.2 3.1 16.2
Net income attributable to the Company 484.5 276.4 329.7
Dividends on unvested common stock, net of tax benefit 0.4 0.4 0.4
Net income attributable to common shareholders $ 484.1 $ 276.0 $ 329.3
Basic earnings per common share (in dollars per share) $ 10.64 $ 6.09 $ 7.29
Basic weighted average shares outstanding (in shares) 45,517 45,316 45,154
Diluted earnings per common share (in dollars per share) $ 10.54 $ 6.03 $ 7.23
Diluted weighted average shares outstanding (in shares) 45,931 45,758 45,528
Other comprehensive income (loss):      
Net income attributable to the Company $ 484.5 $ 276.4 $ 329.7
Change in pension liabilities, net of tax 3.1 8.2 (32.9)
Foreign currency translation adjustments (118.2) 202.0 (182.1)
Comprehensive income attributable to the Company $ 369.4 $ 486.6 $ 114.7