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Consolidated Statements of Changes in Equity - USD ($)
$ in Millions
Total
Cumulative Effect, Period of Adoption, Adjustment
Common Stock
Treasury Stock
APIC
Retained Earnings
Retained Earnings
Cumulative Effect, Period of Adoption, Adjustment
AOCI
Beginning balance (in shares) at Dec. 31, 2019     46,767,164          
Beginning balance at Dec. 31, 2019 $ 803.0 $ 1.1 $ 0.5 $ (1,099.8) $ 538.7 $ 1,362.9 $ 1.1 $ 0.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 89.3         89.3    
Gain on interest rate hedge, net of tax (2.7)             (2.7)
Purchase of treasury stock (140.6)     (140.6)        
Issuance of treasury stock (0.5)     5.2 (5.7)      
Amounts related to share-based compensation (5.6)       (5.6)      
Share-based compensation expense 2.8       2.8      
Ending balance (in shares) at Mar. 31, 2020     46,767,164          
Ending balance at Mar. 31, 2020 746.8   $ 0.5 (1,235.2) 530.2 1,453.3   (2.0)
Beginning balance (in shares) at Dec. 31, 2020     46,767,164          
Beginning balance at Dec. 31, 2020 784.1   $ 0.5 (1,490.9) 533.3 1,743.1   (1.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 55.3         55.3    
Gain on interest rate hedge, net of tax 0.2             0.2
Cash dividends declared ($0.25 per share) (6.8)         (6.8)    
Dividend equivalent units accrued 0.0       0.1 (0.1)    
Purchase of treasury stock (50.0)     (50.0)        
Issuance of treasury stock 0.0     5.6 (5.6)      
Amounts related to share-based compensation (5.8)       (5.8)      
Share-based compensation expense 3.6       3.6      
Ending balance (in shares) at Mar. 31, 2021     46,767,164          
Ending balance at Mar. 31, 2021 $ 780.6   $ 0.5 $ (1,535.3) $ 525.6 $ 1,791.5   $ (1.7)