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CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Income Statement [Abstract] |  |  |  |
Revenue | $ 554.1 | $ 646.6 | $ 1,099.5 | $ 1,281.6
Operating expenses: |  |  |  |
Compensation and related expenses | 232.1 | 292.2 | 458.7 | 544.9
Selling, general and administrative | 96.6 | 114.3 | 192.5 | 223.0
Intangible amortization and impairments | 28.6 | 28.1 | 55.3 | 55.9
Depreciation and other amortization | 5.0 | 4.6 | 10.0 | 9.0
Other operating expenses | 10.0 | 12.2 | 22.5 | 22.1
Total operating expenses | 372.3 | 451.4 | 739.0 | 854.9
Operating income | 181.8 | 195.2 | 360.5 | 426.7
Income from equity method investments | 65.2 | 60.1 | 133.2 | 113.2
Other non-operating (income) and expenses: |  |  |  |
Investment and other income | (11.6) | (16.0) | (15.6) | (16.7)
Interest expense | 21.9 | 22.5 | 44.0 | 44.7
Imputed interest expense and contingent payment arrangements | 0.8 | (13.2) | (1.1) | (40.4)
Total non-operating (income) and expenses | 11.1 | (6.7) | 27.3 | (12.4)
Income before income taxes | 235.9 | 262.0 | 466.4 | 552.3
Income taxes | 53.2 | 72.1 | 109.7 | 141.7
Net income | 182.7 | 189.9 | 356.7 | 410.6
Net income (non-controlling interests) | (75.3) | (61.2) | (144.7) | (153.9)
Net income (controlling interest) | $ 107.4 | $ 128.7 | $ 212.0 | $ 256.7
Average shares outstanding—basic (in shares) | 53.8 | 54.6 | 53.9 | 54.7
Average shares outstanding—diluted (in shares) | 56.5 | 57.5 | 56.5 | 57.7
Earnings per share—basic (in dollars per share) | $ 2.00 | $ 2.36 | $ 3.93 | $ 4.70
Earnings per share—diluted (in dollars per share) | $ 1.97 | $ 2.31 | $ 3.89 | $ 4.58

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