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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, 2023   $ 11.5 $ 35.2 $ 3,356.9 $ (54.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock options exercised     26.3    
Stock-based compensation     6.0    
Net income $ 888.5     888.5  
Cash dividends paid       (669.9)  
Other comprehensive income (loss)         (2.3)
Balance at end of period at Sep. 30, 2024 $ 3,597.4 11.5 67.5 3,575.5 (57.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cash dividends paid per share of common stock (in dollars per share) $ 0.585        
Balance at beginning of period at Dec. 31, 2023   11.5 35.2 3,356.9 (54.8)
Balance at end of period at Dec. 31, 2024 $ 3,616.3 11.5 82.8 3,613.5 (91.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cash dividends paid per share of common stock (in dollars per share) $ 0.780        
Balance at beginning of period at Jun. 30, 2024   11.5 57.8 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 income (loss)         17.4
Balance at end of period at Sep. 30, 2024 $ 3,597.4 11.5 67.5 3,575.5 (57.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cash dividends paid per share of common stock (in dollars per share) $ 0.195        
Balance at end of period at Dec. 31, 2024 $ 3,616.3 11.5 82.8 3,613.5 (91.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cash dividends paid per share of common stock (in dollars per share) $ 0.195        
Stock options exercised     23.9    
Stock-based compensation     6.2    
Net income $ 964.4     964.4  
Cash dividends paid       (751.6)  
Other comprehensive income (loss)         35.3
Balance at end of period at Sep. 30, 2025 $ 3,894.5 11.5 112.9 3,826.3 (56.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cash dividends paid per share of common stock (in dollars per share) $ 0.655        
Balance at beginning of period at Jun. 30, 2025   11.5 104.2 3,743.3 (51.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock options exercised     6.6    
Stock-based compensation     2.1    
Net income $ 335.5     335.5  
Cash dividends paid       (252.5)  
Other comprehensive income (loss)         (4.6)
Balance at end of period at Sep. 30, 2025 $ 3,894.5 $ 11.5 $ 112.9 $ 3,826.3 $ (56.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cash dividends paid per share of common stock (in dollars per share) $ 0.220