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Condensed Consolidated Statements of Stockholders' Equity - USD ($)
$ in Millions
Total
Common stock
Additional paid-in capital
Retained earnings
Accumulated other comprehensive income (loss)
Balance at beginning of period at Dec. 31, 2017   $ 2.9 $ 8.5 $ 2,110.6 $ (25.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock options exercised     11.3    
Purchases of common stock     (16.2) (24.2)  
Stock-based compensation     3.8    
Net earnings $ 583.1     583.1  
Dividends paid in cash       (327.5)  
Other comprehensive income (loss)         (11.6)
Balance at end of period at Sep. 30, 2018 $ 2,315.6 2.9 7.4 2,342.0 (36.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cash dividends paid per share of common stock (in dollars per share) $ 0.57        
Balance at beginning of period at Dec. 31, 2017   2.9 8.5 2,110.6 (25.1)
Balance at end of period at Dec. 31, 2018 $ 2,302.7 2.9 3.0 2,341.6 (44.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cash dividends paid per share of common stock (in dollars per share) $ 0.770        
Balance at beginning of period at Jun. 30, 2018   2.9 0.4 2,259.2 (35.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock options exercised     5.7    
Purchases of common stock     0.0 0.0  
Stock-based compensation     1.3    
Net earnings $ 197.6     197.6  
Dividends paid in cash       (114.8)  
Other comprehensive income (loss)         (0.8)
Balance at end of period at Sep. 30, 2018 $ 2,315.6 2.9 7.4 2,342.0 (36.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cash dividends paid per share of common stock (in dollars per share) $ 0.200        
Balance at end of period at Dec. 31, 2018 $ 2,302.7 2.9 3.0 2,341.6 (44.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cash dividends paid per share of common stock (in dollars per share) $ 0.200        
Stock options exercised     43.0    
Purchases of common stock     0.0 0.0  
Stock-based compensation     4.3    
Net earnings $ 612.2     612.2  
Dividends paid in cash       (372.3)  
Other comprehensive income (loss)         (4.2)
Balance at end of period at Sep. 30, 2019 $ 2,585.7 2.9 50.3 2,581.5 (49.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cash dividends paid per share of common stock (in dollars per share) $ 0.65        
Balance at beginning of period at Jun. 30, 2019   2.9 46.0 2,494.2 (39.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock options exercised     2.9    
Purchases of common stock     0.0 0.0  
Stock-based compensation     1.4    
Net earnings $ 213.5     213.5  
Dividends paid in cash       (126.2)  
Other comprehensive income (loss)         (9.6)
Balance at end of period at Sep. 30, 2019 $ 2,585.7 $ 2.9 $ 50.3 $ 2,581.5 $ (49.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cash dividends paid per share of common stock (in dollars per share) $ 0.220