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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Millions
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Dec. 31, 2014 $ 1,915.3 $ 3.0 $ 33.7 $ 1,886.4 $ (7.8)
Balance (in shares) at Dec. 31, 2014   295,900,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Dividends paid in cash (327.1)     (327.1)  
Purchases of common stock (292.9) $ (0.1) (60.0) (232.8)  
Purchases of common stock (in shares)   (7,100,000)      
Stock options exercised 19.1 $ 0.0 19.1    
Stock options exercised (in shares)   800,000      
Stock-based compensation 5.8   5.8    
Excess tax benefits from stock-based compensation 3.4   3.4    
Net earnings 516.4     516.4  
Other comprehensive income (loss) (38.6)       (38.6)
Balance at Dec. 31, 2015 1,801.4 $ 2.9 2.0 1,842.9 (46.4)
Balance (in shares) at Dec. 31, 2015   289,600,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Dividends paid in cash (346.6)     (346.6)  
Purchases of common stock (59.5) $ 0.0 (3.9) (55.6)  
Purchases of common stock (in shares)   (1,600,000)      
Stock options exercised 29.3 $ 0.0 29.3    
Stock options exercised (in shares)   1,200,000      
Stock-based compensation 4.1   4.1    
Excess tax benefits from stock-based compensation 5.9   5.9    
Net earnings 499.4     499.4  
Other comprehensive income (loss) (0.9)       (0.9)
Balance at Dec. 31, 2016 $ 1,933.1 $ 2.9 37.4 1,940.1 (47.3)
Balance (in shares) at Dec. 31, 2016 289,161,924 289,200,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Dividends paid in cash $ (369.1)     (369.1)  
Purchases of common stock (82.6) $ 0.0 (43.6) (39.0)  
Purchases of common stock (in shares)   (1,900,000)      
Stock options exercised 9.5 $ 0.0 9.5    
Stock options exercised (in shares)   300,000      
Stock-based compensation 5.2   5.2    
Net earnings 578.6     578.6  
Other comprehensive income (loss) 22.2       22.2
Balance at Dec. 31, 2017 $ 2,096.9 $ 2.9 $ 8.5 $ 2,110.6 $ (25.1)
Balance (in shares) at Dec. 31, 2017 287,591,536 287,600,000