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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     5.9    
Stock-based compensation     1.9    
Net income $ 295.1     295.1  
Cash dividends paid       (199.8)  
Other comprehensive (loss) income         4.3
Balance at end of period at Mar. 31, 2023 $ 3,270.6 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)
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        
Stock options exercised     15.8    
Stock-based compensation     2.0    
Net income $ 297.7     297.7  
Cash dividends paid       (223.2)  
Other comprehensive (loss) income         (11.9)
Balance at end of period at Mar. 31, 2024 $ 3,429.2 $ 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