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CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Income Statement [Abstract] |  |  |  |
Revenue | $ 646.6 | $ 636.3 | $ 1,281.6 | $ 1,229.4
Operating expenses: |  |  |  |
Compensation and related expenses | 292.2 | 272.6 | 544.9 | 508.3
Selling, general and administrative | 114.3 | 122.8 | 223.0 | 245.1
Intangible amortization and impairments | 28.1 | 28.1 | 55.9 | 55.5
Depreciation and other amortization | 4.6 | 4.1 | 9.0 | 7.9
Other operating expenses | 12.2 | 10.3 | 22.1 | 20.2
Total operating expenses | 451.4 | 437.9 | 854.9 | 837.0
Operating income | 195.2 | 198.4 | 426.7 | 392.4
Income from equity method investments | 60.1 | 54.7 | 113.2 | 100.9
Other non-operating (income) and expenses: |  |  |  |
Investment and other income | (16.0) | (8.4) | (16.7) | (16.6)
Interest expense | 22.5 | 20.0 | 44.7 | 37.7
Imputed interest expense and contingent payment arrangements | (13.2) | 2.4 | (40.4) | 24.8
Total non-operating (income) and expenses | (6.7) | 14.0 | (12.4) | 45.9
Income before income taxes | 262.0 | 239.1 | 552.3 | 447.4
Income taxes | 72.1 | 61.1 | 141.7 | 110.0
Net income | 189.9 | 178.0 | 410.6 | 337.4
Net income (non-controlling interests) | (61.2) | (78.9) | (153.9) | (161.2)
Net income (controlling interest) | $ 128.7 | $ 99.1 | $ 256.7 | $ 176.2
Average shares outstanding—basic (in shares) | 54.6 | 55.4 | 54.7 | 54.6
Average shares outstanding—diluted (in shares) | 57.5 | 56.6 | 57.7 | 55.9
Earnings per share—basic (in dollars per share) | $ 2.36 | $ 1.79 | $ 4.70 | $ 3.23
Earnings per share—diluted (in dollars per share) | $ 2.31 | $ 1.75 | $ 4.58 | $ 3.15

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