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CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Statement [Abstract] |  |  |
Revenue | $ 2,194.6 | $ 2,484.5 | $ 2,510.9
Operating expenses: |  |  |
Compensation and related expenses | 932.4 | 1,027.7 | 1,030.5
Selling, general and administrative | 398.1 | 443.8 | 485.5
Intangible amortization and impairments | 110.2 | 115.4 | 122.2
Depreciation and other amortization | 19.5 | 18.8 | 16.9
Other operating expenses, net | 29.1 | 43.8 | 40.6
Total operating expenses | 1,489.3 | 1,649.5 | 1,695.7
Operating income | 705.3 | 835.0 | 815.2
Income from equity method investments | 328.8 | 288.9 | 281.7
Other non-operating (income) and expenses: |  |  |
Investment and other income | (33.8) | (15.3) | (23.3)
Interest expense | 89.4 | 88.9 | 76.6
Imputed interest expense and contingent payment arrangements | 3.9 | (40.3) | 30.1
Total other non-operating (income) and expenses | 59.5 | 33.3 | 83.4
Income before income taxes | 974.6 | 1,090.6 | 1,013.5
Income taxes | 235.6 | 263.4 | 246.1
Net income | 739.0 | 827.2 | 767.4
Net income (non-controlling interests) | (266.2) | (317.7) | (333.5)
Net income (controlling interest) | $ 472.8 | $ 509.5 | $ 433.9
Average shares outstanding - basic (in shares) | 54.2 | 54.3 | 55.0
Average shares outstanding - diluted (in shares) | 57.0 | 57.2 | 58.4
Earnings per share - basic (in dollars per share) | $ 8.73 | $ 9.37 | $ 7.89
Earnings per share - diluted (in dollars per share) | $ 8.57 | $ 9.17 | $ 7.70

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