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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) income
Balance at beginning of period at Dec. 31, 2022   $ 5.7 $ 3.6 $ 3,218.7 $ (64.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock options exercised     15.4    
Stock-based compensation     5.6    
Net income $ 888.6     888.6  
Cash dividends paid       (599.5)  
Other comprehensive (loss) income         (6.7)
Balance at end of period at Sep. 30, 2023 $ 3,466.6 5.7 24.6 3,507.8 (71.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cash dividends paid per share of common stock (in dollars per share) $ 1.05        
Balance at beginning of period at Dec. 31, 2022   5.7 3.6 3,218.7 (64.8)
Balance at end of period 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        
Balance at beginning of period at Jun. 30, 2023   5.7 19.9 3,412.1 (56.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock options exercised     2.9    
Stock-based compensation     1.8    
Net income $ 295.5     295.5  
Cash dividends paid       (199.8)  
Other comprehensive (loss) income         (14.6)
Balance at end of period at Sep. 30, 2023 $ 3,466.6 5.7 24.6 3,507.8 (71.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cash dividends paid per share of common stock (in dollars per share) $ 0.35        
Balance at end of period 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) $ 0.35        
Stock options exercised     26.3    
Stock-based compensation     6.0    
Net income $ 888.5     888.5  
Cash dividends paid       (669.9)  
Other comprehensive (loss) income         (2.3)
Balance at end of period at Sep. 30, 2024 $ 3,597.4 5.7 73.3 3,575.5 (57.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cash dividends paid per share of common stock (in dollars per share) $ 1.17        
Balance at beginning of period at Jun. 30, 2024   5.7 63.6 3,500.8 (74.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock options exercised     7.7    
Stock-based compensation     2.0    
Net income $ 298.1     298.1  
Cash dividends paid       (223.4)  
Other comprehensive (loss) income         17.4
Balance at end of period at Sep. 30, 2024 $ 3,597.4 $ 5.7 $ 73.3 $ 3,575.5 $ (57.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cash dividends paid per share of common stock (in dollars per share) $ 0.39