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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)
Balance at end of period at Mar. 31, 2024   11.5 53.0 3,431.4 (66.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cash dividends paid per share of common stock (in dollars per share) $ 0.195        
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     18.6    
Stock-based compensation     4.0    
Net income $ 590.4     590.4  
Cash dividends paid       (446.5)  
Other comprehensive income (loss)         (19.7)
Balance at end of period at Jun. 30, 2024 $ 3,495.6 11.5 57.8 3,500.8 (74.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cash dividends paid per share of common stock (in dollars per share) $ 0.390        
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 Mar. 31, 2024   11.5 53.0 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 income (loss)         (7.8)
Balance at end of period at Jun. 30, 2024 $ 3,495.6 11.5 57.8 3,500.8 (74.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cash dividends paid per share of common stock (in dollars per share) $ 0.195        
Balance at beginning of period at Dec. 31, 2024 $ 3,616.3 11.5 82.8 3,613.5 (91.5)
Balance at end of period at Mar. 31, 2025   11.5 96.1 3,665.5 (82.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cash dividends paid per share of common stock (in dollars per share) $ 0.215        
Balance at beginning 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]          
Stock options exercised     17.3    
Stock-based compensation     4.1    
Net income 628.9     628.9  
Cash dividends paid       (499.1)  
Other comprehensive income (loss)         39.9
Balance at end of period at Jun. 30, 2025 $ 3,807.4 11.5 104.2 3,743.3 (51.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cash dividends paid per share of common stock (in dollars per share) $ 0.435        
Balance at beginning of period at Mar. 31, 2025   11.5 96.1 3,665.5 (82.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock options exercised     6.1    
Stock-based compensation     2.0    
Net income $ 330.3     330.3  
Cash dividends paid       (252.5)  
Other comprehensive income (loss)         31.1
Balance at end of period at Jun. 30, 2025 $ 3,807.4 $ 11.5 $ 104.2 $ 3,743.3 $ (51.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cash dividends paid per share of common stock (in dollars per share) $ 0.220