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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Millions
Total
Common stock
Additional paid-in capital
Retained earnings
Accumulated other comprehensive (loss) income
Balance at beginning of year at Dec. 31, 2021   $ 5.8 $ 96.2 $ 2,970.9 $ (30.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock options exercised   (0.1) 9.3    
Purchases of common stock     (109.1) (128.7)  
Stock-based compensation     7.2    
Net income $ 1,086.9     1,086.9  
Cash dividends paid       (711.3)  
Translation adjustment upon closure of foreign subsidiary       0.9  
Other comprehensive (loss) income         (34.1)
Balance at end of year at Dec. 31, 2022 $ 3,163.2 5.7 3.6 3,218.7 (64.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cash dividends paid per share of common stock (in dollars per share) $ 1.24        
Stock options exercised   0.0 30.1    
Purchases of common stock     0.0 0.0  
Stock-based compensation     7.3    
Net income $ 1,155.0     1,155.0  
Cash dividends paid       (1,016.8)  
Translation adjustment upon closure of foreign subsidiary       0.0  
Other comprehensive (loss) income         10.0
Balance at end of year at Dec. 31, 2023 $ 3,348.8 5.7 41.0 3,356.9 (54.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cash dividends paid per share of common stock (in dollars per share) $ 1.78        
Stock options exercised   0.0 39.6    
Purchases of common stock     0.0 0.0  
Stock-based compensation     8.0    
Net income $ 1,150.6     1,150.6  
Cash dividends paid       (893.3)  
Translation adjustment upon closure of foreign subsidiary       (0.7)  
Other comprehensive (loss) income         (36.7)
Balance at end of year at Dec. 31, 2024 $ 3,616.3 $ 5.7 $ 88.6 $ 3,613.5 $ (91.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cash dividends paid per share of common stock (in dollars per share) $ 1.56