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CONSOLIDATED STATEMENTS OF INCOME - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement [Abstract]      
Revenue $ 2,305.0 $ 2,194.6 $ 2,484.5
Operating expenses:      
Compensation and related expenses 979.0 932.4 1,027.7
Selling, general and administrative 373.1 398.1 443.8
Intangible amortization and impairments 86.4 110.2 115.4
Depreciation and other amortization 20.3 19.5 18.8
Other operating expenses (net) 40.5 29.1 43.8
Total operating expenses 1,499.3 1,489.3 1,649.5
Operating income before income from equity method investments 805.7 705.3 835.0
Income from equity method investments 302.2 328.8 288.9
Operating income 1,107.9 1,034.1 1,123.9
Non-operating (income) and expenses:      
Investment and other income (60.0) (33.8) (15.3)
Interest expense 85.3 89.4 88.9
Imputed interest expense and contingent payment arrangements 15.5 3.9 (40.3)
Total other non-operating (income) and expenses 40.8 59.5 33.3
Income before income taxes 1,067.1 974.6 1,090.6
Income tax expense 58.4 235.6 263.4
Net income 1,008.7 739.0 827.2
Net income (non-controlling interests) (319.2) (266.2) (317.7)
Net income (controlling interest) $ 689.5 $ 472.8 $ 509.5
Average shares outstanding - basic (in shares) 56.0 54.2 54.3
Average shares outstanding - diluted (in shares) 58.6 57.0 57.2
Earnings per share - basic (in dollars per share) $ 12.30 $ 8.73 $ 9.37
Earnings per share - diluted (in dollars per share) 12.03 8.57 9.17
Dividends per share (in dollars per share) $ 0.80 $ 0 $ 0