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Consolidated Statements of Stockholders' Equity (unaudited) - USD ($)
shares in Millions, $ 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, 2023 $ 2,332.0 $ 0.5 $ 1,682.8 $ 664.9 $ (16.2) $ 0.0
Beginning balance, shares at Dec. 31, 2023   48.6       0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 39.2     39.2    
Other comprehensive income (loss) (0.4)       (0.4)  
Dividends paid to common stockholders (2.4)     (2.4)    
Restricted shares, net - shares   0.0       0.0
Restricted shares, net - value 5.4   6.8     $ (1.4)
Ending balance at Mar. 31, 2024 2,373.8 $ 0.5 1,689.6 701.7 (16.6) $ (1.4)
Ending balance, shares at Mar. 31, 2024   48.6       0.0
Beginning balance at Dec. 31, 2024 2,428.2 $ 0.5 1,696.5 748.9 (17.7) $ 0.0
Beginning balance, shares at Dec. 31, 2024   48.8       0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 23.6     23.6    
Other comprehensive income (loss) 0.0       0.0  
Dividends paid to common stockholders (2.5)     (2.5)    
Restricted shares, net - shares   0.0       0.0
Restricted shares, net - value 5.2   6.8     $ (1.6)
Ending balance at Mar. 31, 2025 $ 2,454.5 [1] $ 0.5 $ 1,703.3 $ 770.0 $ (17.7) $ (1.6)
Ending balance, shares at Mar. 31, 2025   48.8       0.0
Statement of Stockholders' Equity [Abstract]            
Common Stock, Par or Stated Value Per Share $ 0.01          
[1] (unaudited)