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CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Millions, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Income Statement [Abstract] |  |
Revenue | $ 545.4 | $ 635.0
Operating expenses: |  |
Compensation and related expenses | 226.7 | 252.8
Selling, general and administrative | 95.9 | 108.7
Intangible amortization and impairments | 26.6 | 27.8
Depreciation and other amortization | 5.0 | 4.4
Other operating expenses | 12.4 | 9.9
Total operating expenses | 366.6 | 403.6
Operating income | 178.8 | 231.4
Income from equity method investments | 68.0 | 53.1
Other non-operating (income) and expenses: |  |
Investment and other income | (4.0) | (0.8)
Interest expense | 22.3 | 22.2
Imputed interest expense and contingent payment arrangements | (2.0) | (27.2)
Total non-operating (income) and expenses | 16.3 | (5.8)
Income before income taxes | 230.5 | 290.3
Income taxes | 56.5 | 69.6
Net income | 174.0 | 220.7
Net income (non-controlling interests) | (69.5) | (92.7)
Net income (controlling interest) | $ 104.5 | $ 128.0
Average shares outstanding—basic (in shares) | 54.0 | 54.8
Average shares outstanding—diluted (in shares) | 56.5 | 57.8
Earnings per share—basic (in dollars per share) | $ 1.94 | $ 2.34
Earnings per share—diluted (in dollars per share) | $ 1.92 | $ 2.28

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