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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

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