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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, 2021 $ 1,953.3 $ 0.5 $ 1,692.6 $ 279.5 $ (19.3) $ 0.0
Beginning balance, shares at Dec. 31, 2021   48.3       0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 91.2     91.2    
Other comprehensive income (loss) 3.5       3.5  
Dividends paid to common stockholders (7.4)     (7.4)    
Restricted shares, net - shares   0.6       (0.2)
Restricted shares, net - value 5.7   16.0     $ (10.3)
Shares repurchased, shares           (0.3)
Shares repurchased (15.0)         $ (15.0)
Ending balance at Sep. 30, 2022 2,031.3 $ 0.5 1,708.6 363.3 (15.8) $ (25.3)
Ending balance, shares at Sep. 30, 2022   48.9       0.5
Beginning balance at Jun. 30, 2022 1,996.0 $ 0.5 1,703.1 333.7 (16.3) $ (25.0)
Beginning balance, shares at Jun. 30, 2022   48.9       0.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 32.0     32.0    
Other comprehensive income (loss) 0.5       0.5  
Dividends paid to common stockholders (2.4)     (2.4)    
Restricted shares, net - shares   0.0       0.0
Restricted shares, net - value 5.2   5.5     $ (0.3)
Ending balance at Sep. 30, 2022 2,031.3 $ 0.5 1,708.6 363.3 (15.8) $ (25.3)
Ending balance, shares at Sep. 30, 2022   48.9       0.5
Beginning balance at Dec. 31, 2022 2,184.4 $ 0.5 1,684.1 515.5 (15.7) $ 0.0
Beginning balance, shares at Dec. 31, 2022   48.4       0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 132.1     132.1    
Other comprehensive income (loss) (1.1)       (1.1)  
Dividends paid to common stockholders (7.3)     (7.3)    
Restricted shares, net - shares   0.5       (0.1)
Restricted shares, net - value 7.2   19.0     $ (11.8)
Retirement of treasury stock - shares   0.1       0.1
Retirement of treasury stock - value 0.0   11.6     $ 11.6
Ending balance at Sep. 30, 2023 2,315.3 [1] $ 0.5 1,691.5 640.3 (16.8) $ (0.2)
Ending balance, shares at Sep. 30, 2023   48.8       0.0
Beginning balance at Jun. 30, 2023 2,277.3 $ 0.5 1,685.6 607.3 (16.1) $ 0.0
Beginning balance, shares at Jun. 30, 2023   48.8       0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 35.5     35.5    
Other comprehensive income (loss) (0.7)       (0.7)  
Dividends paid to common stockholders (2.5)     (2.5)    
Restricted shares, net - shares   0.0       0.0
Restricted shares, net - value 5.7   5.9     $ (0.2)
Ending balance at Sep. 30, 2023 $ 2,315.3 [1] $ 0.5 $ 1,691.5 $ 640.3 $ (16.8) $ (0.2)
Ending balance, shares at Sep. 30, 2023   48.8       0.0
Statement of Stockholders' Equity [Abstract]            
Common Stock, Par or Stated Value Per Share $ 0.01          
[1] (unaudited)