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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

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