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CONSOLIDATED STATEMENTS OF INCOME (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Income Statement [Abstract] |  |  |  |
Revenue | $ 636.3 | $ 541.0 | $ 1,229.4 | $ 1,043.3
Operating expenses: |  |  |  |
Compensation and related expenses | 272.6 | 235.4 | 508.3 | 450.0
Selling, general and administrative | 122.8 | 99.5 | 245.1 | 191.8
Intangible amortization and impairments | 28.1 | 32.6 | 55.5 | 65.5
Depreciation and other amortization | 4.1 | 3.3 | 7.9 | 6.9
Other operating expenses | 10.3 | 8.8 | 20.2 | 17.2
Total operating expenses | 437.9 | 379.6 | 837.0 | 731.4
Operating income | 198.4 | 161.4 | 392.4 | 311.9
Income from equity method investments | 56.3 | 36.2 | 102.5 | 86.9
Other non-operating (income) and expenses: |  |  |  |
Investment and other income | (8.4) | (7.5) | (16.6) | (12.0)
Interest expense | 20.0 | 24.3 | 37.7 | 48.5
Imputed interest expense and contingent payment arrangements | 2.4 | 8.4 | 24.8 | 22.6
Total non-operating (income) and expenses | 14.0 | 25.2 | 45.9 | 59.1
Income before income taxes | 240.7 | 172.4 | 449.0 | 339.7
Income taxes | 61.7 | 38.2 | 110.6 | 75.7
Net income | 179.0 | 134.2 | 338.4 | 264.0
Net income (non-controlling interests) | (78.9) | (69.5) | (161.2) | (136.9)
Net income (controlling interest) | $ 100.1 | $ 64.7 | $ 177.2 | $ 127.1
Average shares outstanding—basic (in shares) | 55.4 | 53.1 | 54.6 | 52.9
Average shares outstanding—diluted (in shares) | 58.7 | 54.6 | 55.9 | 54.4
Earnings per share-basic (in dollars per share) | $ 1.81 | $ 1.22 | $ 3.25 | $ 2.40
Earnings per share-diluted (in dollars per share) | $ 1.77 | $ 1.18 | $ 3.17 | $ 2.33

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