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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
Balance (in shares) at Dec. 31, 2017     46,767,164          
Balance at Dec. 31, 2017 $ 738.4   $ 0.5 $ (806.5) $ 549.9 $ 994.5   $ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 213.6         213.6    
Purchase of treasury stock (144.4)     (144.4)        
Issuance of treasury stock 0.0     10.6 (10.6)      
Amounts related to share-based compensation (9.4)       (9.4)      
Share-based compensation expense 9.1       9.1      
Balance at Dec. 31, 2018 807.3   $ 0.5 (940.3) 539.0 1,208.1   0.0
Balance (in shares) at Dec. 31, 2018     46,767,164          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 154.8         154.8    
Loss on interest rate hedge, net of tax 0.7             0.7
Purchase of treasury stock (165.8)     (165.8)        
Issuance of treasury stock 0.0     6.3 (6.3)      
Amounts related to share-based compensation (4.5)       (4.5)      
Share-based compensation expense 10.5       10.5      
Balance at Dec. 31, 2019 $ 803.0   $ 0.5 (1,099.8) 538.7 1,362.9   0.7
Balance (in shares) at Dec. 31, 2019 46,767,164   46,767,164          
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income $ 386.1 $ 1.1       386.1 $ 1.1  
Loss on interest rate hedge, net of tax (2.6)             (2.6)
Cash dividends declared, ($0.25 per share) (6.9)         (6.9)    
Dividend equivalent units accrued 0.0       0.1 (0.1)    
Purchase of treasury stock (399.6)     (399.6)        
Issuance of treasury stock (0.5)     8.5 (9.0)      
Amounts related to share-based compensation (10.7)       (10.7)      
Share-based compensation expense 14.2       14.2      
Balance at Dec. 31, 2020 $ 784.1   $ 0.5 $ (1,490.9) $ 533.3 $ 1,743.1   $ (1.9)
Balance (in shares) at Dec. 31, 2020 46,767,164   46,767,164