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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 20.2     20.2    
Other comprehensive income (loss) 2.2       2.2  
Dividends paid to common stockholders (2.4)     (2.4)    
Restricted shares, net - shares   0.0       0.0
Restricted shares, net - value 4.3   4.5     $ (0.2)
Ending balance at Mar. 31, 2022 1,977.6 $ 0.5 1,697.1 297.3 (17.1) $ (0.2)
Ending balance, shares at Mar. 31, 2022   48.3       0.0
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 55.7     55.7    
Other comprehensive income (loss) (0.2)       (0.2)  
Dividends paid to common stockholders (2.4)     (2.4)    
Restricted shares, net - shares   0.0       0.0
Restricted shares, net - value 5.7   6.2     $ (0.5)
Ending balance at Mar. 31, 2023 $ 2,243.2 [1] $ 0.5 $ 1,690.3 $ 568.8 $ (15.9) $ (0.5)
Ending balance, shares at Mar. 31, 2023   48.4       0.0
Statement of Stockholders' Equity [Abstract]            
Common Stock, Par or Stated Value Per Share $ 0.01          
[1] (unaudited)