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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)
Balance at end of period at Mar. 31, 2023   5.7 11.4 3,314.0 (60.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cash dividends paid per share of common stock (in dollars per share) $ 0.35        
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     12.5    
Stock-based compensation     3.8    
Net income $ 593.1     593.1  
Cash dividends paid       (399.7)  
Other comprehensive (loss) income         7.9
Balance at end of period at Jun. 30, 2023 $ 3,380.8 5.7 19.9 3,412.1 (56.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cash dividends paid per share of common stock (in dollars per share) $ 0.70        
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 Mar. 31, 2023   5.7 11.4 3,314.0 (60.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock options exercised     6.6    
Stock-based compensation     1.9    
Net income $ 298.0     298.0  
Cash dividends paid       (199.9)  
Other comprehensive (loss) income         3.6
Balance at end of period at Jun. 30, 2023 $ 3,380.8 5.7 19.9 3,412.1 (56.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cash dividends paid per share of common stock (in dollars per share) $ 0.35        
Balance at beginning of period at Dec. 31, 2023 $ 3,348.8 5.7 41.0 3,356.9 (54.8)
Balance at end of period at Mar. 31, 2024   5.7 58.8 3,431.4 (66.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cash dividends paid per share of common stock (in dollars per share) $ 0.39        
Balance at beginning 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]          
Stock options exercised     18.6    
Stock-based compensation     4.0    
Net income 590.4     590.4  
Cash dividends paid       (446.5)  
Other comprehensive (loss) income         (19.7)
Balance at end of period at Jun. 30, 2024 $ 3,495.6 5.7 63.6 3,500.8 (74.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cash dividends paid per share of common stock (in dollars per share) $ 0.78        
Balance at beginning of period at Mar. 31, 2024   5.7 58.8 3,431.4 (66.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock options exercised     2.8    
Stock-based compensation     2.0    
Net income $ 292.7     292.7  
Cash dividends paid       (223.3)  
Other comprehensive (loss) income         (7.8)
Balance at end of period at Jun. 30, 2024 $ 3,495.6 $ 5.7 $ 63.6 $ 3,500.8 $ (74.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cash dividends paid per share of common stock (in dollars per share) $ 0.39