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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 loss
Balance at beginning of period at Dec. 31, 2019   $ 2.9 $ 67.2 $ 2,633.9 $ (38.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock options exercised     7.4    
Purchases of common stock     (52.0)    
Stock-based compensation     1.6    
Net earnings $ 202.6     202.6  
Dividends paid in cash       (143.6)  
Other comprehensive loss         (25.0)
Balance at end of period at Mar. 31, 2020 $ 2,656.6 2.9 24.2 2,692.9 (63.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cash dividends paid per share of common stock (in dollars per share) $ 0.25        
Balance at beginning of period at Dec. 31, 2019   2.9 67.2 2,633.9 (38.4)
Balance at end of period at Dec. 31, 2020 $ 2,733.2 2.9 61.9 2,689.6 (21.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cash dividends paid per share of common stock (in dollars per share) $ 1.40        
Stock options exercised     6.6    
Purchases of common stock     0.0    
Stock-based compensation     1.5    
Net earnings $ 210.6     210.6  
Dividends paid in cash       (160.8)  
Other comprehensive loss         (4.4)
Balance at end of period at Mar. 31, 2021 $ 2,786.7 $ 2.9 $ 70.0 $ 2,739.4 $ (25.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cash dividends paid per share of common stock (in dollars per share) $ 0.28