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CONSOLIDATED STATEMENTS OF INCOME - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Statement [Abstract]      
Revenue $ 2,484.5 $ 2,510.9 $ 2,188.8
Operating expenses:      
Compensation and related expenses 1,027.7 1,030.5 947.5
Selling, general and administrative 443.8 485.5 427.2
Intangible amortization and impairments 115.4 122.2 128.2
Depreciation and other amortization 18.8 16.9 14.0
Other operating expenses 43.8 40.6 37.8
Total operating expenses 1,649.5 1,695.7 1,554.7
Operating income 835.0 815.2 634.1
Income from equity method investments 288.9 281.7 307.8
Other non-operating (income) and expenses:      
Investment and other (income) expense (15.3) (23.3) (40.8)
Interest expense 88.9 76.6 87.3
Imputed interest expense and contingent payment arrangements (40.3) 30.1 31.7
Total non-operating (income) and expenses 33.3 83.4 78.2
Income before income taxes 1,090.6 1,013.5 863.7
Income taxes 256.9 227.9 194.1
Net income 833.7 785.6 669.6
Net income (non-controlling interests) (317.7) (333.5) (309.1)
Net income (controlling interest) $ 516.0 $ 452.1 $ 360.5
Average shares outstanding - basic (in shares) 54.3 55.0 53.1
Average shares outstanding - diluted (in shares) 57.2 58.4 56.7
Earnings per share - basic (in dollars per share) $ 9.49 $ 8.22 $ 6.79
Earnings per share - diluted (in dollars per share) $ 9.28 $ 8.01 $ 6.55