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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
Balance at beginning of period at Dec. 31, 2024   $ 11.5 $ 82.8 $ 3,613.5 $ (91.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Purchases of common stock   0.0 0.0    
Stock options exercised   0.0 11.2    
Stock-based compensation     2.0    
Net income $ 298.7     298.7  
Cash dividends paid       (246.7)  
Other comprehensive (loss) income         8.8
Balance at end of period at Mar. 31, 2025 $ 3,690.3 11.5 96.0 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   11.5 82.8 3,613.5 (91.5)
Balance at end of period at Dec. 31, 2025 $ 3,943.6 11.5 115.5 3,867.7 (51.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cash dividends paid per share of common stock (in dollars per share) $ 0.875        
Purchases of common stock   0.0 (20.3)    
Stock options exercised   0.0 7.6    
Stock-based compensation     2.6    
Net income $ 339.8     339.8  
Cash dividends paid       (275.6)  
Other comprehensive (loss) income         (8.2)
Balance at end of period at Mar. 31, 2026 $ 3,989.5 $ 11.5 $ 105.3 $ 3,931.9 $ (59.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Cash dividends paid per share of common stock (in dollars per share) $ 0.240