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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Millions
Total
Common Stock
Capital in Excess of Par Value
Retained Earnings
Accumulated Other Comprehensive Loss
Treasury Stock, Common
Beginning balance at Dec. 31, 2021 $ 1,953.3 $ 0.5 $ 1,692.6 $ 279.5 $ (19.3) $ 0.0
Beginning balance, shares at Dec. 31, 2021   48,300,000       0
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 245.8     245.8    
Other comprehensive income (loss) 3.6       3.6  
Cash dividends on common stock (9.8)     (9.8)    
Restricted shares, net, value 6.5   20.1     $ (13.6)
Restricted shares, net, shares   700,000       300,000
Shares repurchased, value (15.0)         $ (15.0)
Shares repurchased, shares           (300,000)
Retirement of treasury stock, value 0.0   (28.6)     $ (28.6)
Retirement of treasury stock, shares   (600,000)       (600,000)
Ending balance at Dec. 31, 2022 2,184.4 $ 0.5 1,684.1 515.5 (15.7) $ 0.0
Ending balance, shares at Dec. 31, 2022   48,400,000       0
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 159.2     159.2    
Other comprehensive income (loss) (0.5)       (0.5)  
Cash dividends on common stock (9.8)     (9.8)    
Restricted shares, net, value 12.5   24.6     $ (12.1)
Restricted shares, net, shares   500,000       100,000
Shares repurchased, value $ (13.8)         $ (13.8)
Shares repurchased, shares (200,000)         (200,000)
Retirement of treasury stock, value $ 0.0   (25.9)     $ (25.9)
Retirement of treasury stock, shares   (300,000)       (300,000)
Ending balance at Dec. 31, 2023 $ 2,332.0 $ 0.5 1,682.8 664.9 (16.2) $ 0.0
Ending balance, shares at Dec. 31, 2023   48,600,000       0
Statement of Stockholders' Equity [Abstract]            
Common stock, par value (in dollars per share) $ 0.01          
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income $ 93.7     93.7    
Other comprehensive income (loss) (1.5)       (1.5)  
Cash dividends on common stock (9.7)     (9.7)    
Restricted shares, net, value 13.7   25.8     $ (12.1)
Restricted shares, net, shares   300,000       100,000
Retirement of treasury stock, value 0.0   (12.1)     $ (12.1)
Retirement of treasury stock, shares   (100,000)       (100,000)
Ending balance at Dec. 31, 2024 $ 2,428.2 $ 0.5 $ 1,696.5 $ 748.9 $ (17.7) $ 0.0
Ending balance, shares at Dec. 31, 2024   48,800,000       0
Statement of Stockholders' Equity [Abstract]            
Common stock, par value (in dollars per share) $ 0.01