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CONSOLIDATED STATEMENTS OF INCOME (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Income Statement [Abstract] |  |  |
Revenue | $ 2,188.8 | $ 1,805.5 | $ 1,704.8
Operating expenses: |  |  |
Compensation and related expenses | 947.5 | 784.7 | 718.8
Selling, general and administrative | 427.2 | 366.9 | 350.8
Intangible amortization and impairments | 128.2 | 200.0 | 97.7
Depreciation and other amortization | 14.0 | 14.1 | 15.0
Other operating expenses | 37.8 | 39.4 | 36.4
Total operating expenses | 1,554.7 | 1,405.1 | 1,218.7
Operating income | 634.1 | 400.4 | 486.1
Income from equity method investments | 307.8 | 129.7 | 72.7
Other non-operating (income) and expenses: |  |  |
Investment and other (income) loss | (40.8) | (22.0) | 5.0
Interest expense | 87.3 | 83.0 | 73.8
Imputed interest expense and contingent payment arrangements | 31.7 | (26.1) | 27.3
Total non-operating (income) and expenses | 78.2 | 34.9 | 106.1
Income before income taxes | 863.7 | 495.2 | 452.7
Income taxes | 194.1 | 83.8 | 93.1
Net income | 669.6 | 411.4 | 359.6
Net income (non-controlling interests) | (309.1) | (237.4) | (194.7)
Net income (controlling interest) | $ 360.5 | $ 174.0 | $ 164.9
Earnings per share - basic (in dollars per share) | $ 6.79 | $ 3.36 | $ 3.18
Earnings per share - diluted (in dollars per share) | $ 6.55 | $ 3.28 | $ 3.11
Average shares outstanding - basic (in shares) | 53.1 | 51.7 | 51.8
Average shares outstanding - diluted (in shares) | 56.7 | 53.0 | 53.0

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