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CONSOLIDATED STATEMENTS OF INCOME (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Revenue $ 417.7 $ 426.3
Operating expenses:    
Compensation and related expenses 181.1 179.5
Selling, general and administrative 85.0 87.5
Amortization of intangible assets 30.4 22.1
Depreciation and other amortization 3.4 3.8
Other operating expenses 9.0 8.5
Total operating expenses 308.9 301.4
Operating income 108.8 124.9
Non-operating (income) and expenses:    
Investment and other income (10.4) (8.7)
Income from equity method investments (14.5) (10.2)
Interest expense 18.6 19.4
Imputed interest expense and contingent payment arrangements (2.5) 8.3
Total non-operating (income) and expenses (8.8) 8.8
Income before income taxes 117.6 116.1
Income taxes 24.6 26.7
Net income 93.0 89.4
Net income (non-controlling interests) (55.6) (50.3)
Net income (controlling interest) $ 37.4 $ 39.1
Average shares outstanding - basic (in shares) 51.6 51.8
Average shares outstanding - diluted (in shares) 52.9 53.1
Earnings per share - basic (in dollars per share) $ 0.72 $ 0.76
Earnings per share - diluted (in dollars per share) $ 0.71 $ 0.74