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CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Income Statement [Abstract]    
Revenue $ 545.4 $ 635.0
Operating expenses:    
Compensation and related expenses 226.7 252.8
Selling, general and administrative 95.9 108.7
Intangible amortization and impairments 26.6 27.8
Depreciation and other amortization 5.0 4.4
Other operating expenses 12.4 9.9
Total operating expenses 366.6 403.6
Operating income 178.8 231.4
Income from equity method investments 68.0 53.1
Other non-operating (income) and expenses:    
Investment and other income (4.0) (0.8)
Interest expense 22.3 22.2
Imputed interest expense and contingent payment arrangements (2.0) (27.2)
Total non-operating (income) and expenses 16.3 (5.8)
Income before income taxes 230.5 290.3
Income taxes 56.5 69.6
Net income 174.0 220.7
Net income (non-controlling interests) (69.5) (92.7)
Net income (controlling interest) $ 104.5 $ 128.0
Average shares outstanding—basic (in shares) 54.0 54.8
Average shares outstanding—diluted (in shares) 56.5 57.8
Earnings per share—basic (in dollars per share) $ 1.94 $ 2.34
Earnings per share—diluted (in dollars per share) $ 1.92 $ 2.28