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Condensed Consolidated Statements of Equity (Unaudited) - USD ($)
$ in Millions
Total
Common Stock
Paid-In Capital
Accumulated Other Comprehensive Income (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 77.4       77.4    
Other comprehensive income 7.2     7.2      
Stock options exercised 8.7   8.7        
Stock-based compensation 1.7   9.5     (7.8)  
Treasury stock purchase (27.3)         (27.3)  
Ending Balance at Mar. 31, 2017 2,430.7 1.7 2,672.0 (64.7) 892.0 (1,071.8) 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 74.9       75.0   (0.1)
Other comprehensive income 3.2     3.2      
Stock options exercised 3.2 0.1 3.1        
Stock-based compensation 0.4   12.6     (12.2)  
Treasury stock purchase (325.2)         (325.2)  
Dividends 0.7       0.7    
Ending Balance at Mar. 31, 2018 $ 2,358.3 $ 1.8 $ 2,740.6 $ (36.0) $ 1,249.9 $ (1,599.5) $ 1.5