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Condensed Consolidated Statements of Equity (Unaudited) - USD ($)
$ in Millions
Total
Common Stock
Paid-In Capital
Accumulated Other Comprehensive Loss
Retained Earnings
Treasury Stock
Non- controlling Interests
Beginning Balance at Dec. 31, 2016 $ 2,363.0 $ 1.7 $ 2,653.8 $ (71.9) $ 814.6 $ (1,036.7) $ 1.5
Comprehensive income:              
Net income 215.1       215.1    
Other comprehensive income (loss) 17.3     17.3      
Stock options exercised 22.1   22.1        
Stock-based compensation 11.6   20.9     (9.3)  
Treasury stock purchase (32.7)         (32.7)  
Dividends (27.7)       (27.7)    
Ending Balance at Jun. 30, 2017 2,568.7 1.7 2,696.8 (54.6) 1,002.0 (1,078.7) 1.5
Beginning Balance at Dec. 31, 2017 2,601.1 1.7 2,724.9 (39.2) 1,174.2 (1,262.1) 1.6
Comprehensive income:              
Net income 204.6       204.6    
Other comprehensive income (loss) (14.0)     (14.0)      
Stock options exercised 3.8 0.1 3.7        
Stock-based compensation 10.2   22.9     (12.7)  
Treasury stock purchase (602.7)         (602.7)  
Dividends (28.3)       (28.3)    
Ending Balance at Jun. 30, 2018 $ 2,174.7 $ 1.8 $ 2,751.5 $ (53.2) $ 1,350.5 $ (1,877.5) $ 1.6