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CONSOLIDATED STATEMENTS OF EQUITY (USD $)
In Millions, except Share data, unless otherwise specified
Total
Common Stock
Retained Earnings
Accumulated Other Comprehensive (Loss) Income
Non-controlling Interests
Comprehensive Income
Balance at Dec. 31, 2008 $ 2,435.1 $ 563.1 $ 1,900.4 $ (32.0) $ 3.6  
Balance (in shares) at Dec. 31, 2008   73,312,714        
Increase (Decrease) in Stockholders' Equity            
Net income 149.2   148.2   1.0 149.2
Other comprehensive (loss) income:            
Foreign currency translation gain (loss) 25.9     25.9   25.9
Unrealized gain (loss) on investments, net of tax 0.5     0.5   0.5
Minimum pension liability, net of tax 4.1     4.1   4.1
Comprehensive income 179.7         179.7
Noncontrolling interests purchased (2.7) (1.8)     (0.9)  
Payments to noncontrolling interest holders (2.1)       (2.1)  
Share-based compensation 15.5 15.5        
Stock options exercised 10.5 10.5        
Stock options exercised (in shares)   427,697        
Share-based compensation tax benefits (deficit) 1.2   1.2      
Stock issued under incentive bonus plan 0.3 0.3        
Stock issued under incentive bonus plan (in shares)   10,360        
Cash dividends - $0.48, $0.40 and $0.40 per share for the year ended on December 31, 2011, December 31, 2010 and December 31, 2009, respectively (29.4)   (29.4)      
Balance at Dec. 31, 2009 2,608.1 587.6 2,020.4 (1.5) 1.6  
Balance (in shares) at Dec. 31, 2009   73,750,771        
Increase (Decrease) in Stockholders' Equity            
Net income 197.9   194.4   3.5 197.9
Other comprehensive (loss) income:            
Foreign currency translation gain (loss) 9.7     9.7   9.7
Unrealized gain (loss) on investments, net of tax 0.2     0.2   0.2
Minimum pension liability, net of tax 1.9     1.9   1.9
Comprehensive income 209.7         209.7
Issuance of equity interest in subsidiary to noncontrolling interests 0.2 (1.4)     1.6  
Consolidation of a joint venture entity 1.5       1.5  
Payments to noncontrolling interest holders (1.8)       (1.8)  
Share-based compensation 17.3 17.3        
Share-based compensation (in shares)   61,000        
Stock options exercised 21.2 21.2        
Stock options exercised (in shares)   827,452        
Share-based compensation tax benefits (deficit) 3.6   3.6      
Cash dividends - $0.48, $0.40 and $0.40 per share for the year ended on December 31, 2011, December 31, 2010 and December 31, 2009, respectively (29.7)   (29.7)      
Balance at Dec. 31, 2010 2,830.1 624.7 2,188.7 10.3 6.4  
Balance (in shares) at Dec. 31, 2010 74,639,223 74,639,223        
Increase (Decrease) in Stockholders' Equity            
Net income 349.2   343.8   5.4 349.2
Other comprehensive (loss) income:            
Foreign currency translation gain (loss) (9.9)     (9.9)   (9.9)
Unrealized gain (loss) on investments, net of tax (0.2)     (0.2)   (0.2)
Minimum pension liability, net of tax (9.0)     (9.0)   (9.0)
Comprehensive income 330.1         330.1
Payments to noncontrolling interest holders (3.7)       (3.7)  
Share-based compensation 21.3 21.3        
Share-based compensation (in shares)   102,079        
Stock options exercised 11.1 11.1        
Stock options exercised (in shares)   266,392        
Share-based compensation tax benefits (deficit) (1.0)   (1.0)      
Cash dividends - $0.48, $0.40 and $0.40 per share for the year ended on December 31, 2011, December 31, 2010 and December 31, 2009, respectively (35.9)   (35.9)      
Balance at Dec. 31, 2011 $ 3,152.0 $ 657.1 $ 2,495.6 $ (8.8) $ 8.1  
Balance (in shares) at Dec. 31, 2011 75,007,694 75,007,694