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CONSOLIDATED STATEMENTS OF INCOME (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Income Statement [Abstract] |  |  |  |
Revenue | $ 640.3 | $ 551.6 | $ 1,869.7 | $ 1,594.8
Operating expenses: |  |  |  |
Compensation and related expenses | 258.1 | 229.8 | 766.5 | 679.7
Selling, general and administrative | 114.4 | 106.4 | 359.5 | 298.2
Intangible amortization and impairments | 28.7 | 32.7 | 84.2 | 98.1
Depreciation and other amortization | 4.5 | 3.4 | 12.3 | 10.3
Other operating expenses | 10.4 | 10.2 | 30.6 | 27.5
Total operating expenses | 416.1 | 382.5 | 1,253.1 | 1,113.8
Operating income | 224.2 | 169.1 | 616.6 | 481.0
Income from equity method investments | 50.1 | 34.1 | 152.6 | 121.0
Other non-operating (income) and expenses: |  |  |  |
Investment and other income | (2.6) | (8.0) | (19.2) | (20.0)
Interest expense | 19.0 | 19.9 | 56.7 | 68.5
Imputed interest expense and contingent payment arrangements | 2.8 | 3.9 | 27.6 | 26.5
Total non-operating (income) and expenses | 19.2 | 15.8 | 65.1 | 75.0
Income before income taxes | 255.1 | 187.4 | 704.1 | 527.0
Income taxes | 64.1 | 31.0 | 174.7 | 106.6
Net income | 191.0 | 156.4 | 529.4 | 420.4
Net income (non-controlling interests) | (86.7) | (81.2) | (247.9) | (218.1)
Net income (controlling interest) | $ 104.3 | $ 75.2 | $ 281.5 | $ 202.3
Average shares outstanding—basic (in shares) | 55.6 | 53.2 | 54.9 | 53.0
Average shares outstanding—diluted (in shares) | 58.8 | 56.9 | 56.1 | 54.7
Earnings per share—basic (in dollars per share) | $ 1.88 | $ 1.41 | $ 5.13 | $ 3.82
Earnings per share—diluted (in dollars per share) | $ 1.84 | $ 1.37 | $ 5.01 | $ 3.70

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