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Consolidated Statements of Changes in Equity (unaudited) - USD ($)
$ in Millions
Total
Common Stock
Treasury Stock
APIC
Retained Earnings
AOCI
Beginning balance (in shares) at Dec. 31, 2021   46,767,164        
Beginning balance at Dec. 31, 2021 $ 807.2 $ 0.5 $ (1,839.3) $ 534.8 $ 2,112.4 $ (1.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 152.4       152.4  
Amortization of unrealized loss on interest rate hedge, net of tax 0.2         0.2
Cash dividends declared (7.2)       (7.2)  
Purchase of treasury stock (151.8)   (151.8)      
Issuance of treasury stock 0.0   8.8 (8.8)    
Amounts related to share-based compensation (12.2)     (12.2)    
Share-based compensation expense 2.9     2.9    
Ending balance (in shares) at Mar. 31, 2022   46,767,164        
Ending balance at Mar. 31, 2022 791.5 $ 0.5 (1,982.3) 516.7 2,257.6 (1.0)
Beginning balance (in shares) at Dec. 31, 2021   46,767,164        
Beginning balance at Dec. 31, 2021 807.2 $ 0.5 (1,839.3) 534.8 2,112.4 (1.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 555.2          
Ending balance (in shares) at Sep. 30, 2022   46,767,164        
Ending balance at Sep. 30, 2022 766.0 $ 0.5 (2,394.0) 514.9 2,645.3 (0.7)
Beginning balance (in shares) at Mar. 31, 2022   46,767,164        
Beginning balance at Mar. 31, 2022 791.5 $ 0.5 (1,982.3) 516.7 2,257.6 (1.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 183.3       183.3  
Amortization of unrealized loss on interest rate hedge, net of tax 0.2         0.2
Cash dividends declared (7.4)       (7.4)  
Dividend equivalent units accrued 0.0     0.2 (0.2)  
Purchase of treasury stock (203.6)   (203.6)      
Issuance of treasury stock (0.1)   2.5 (2.6)    
Amounts related to share-based compensation (5.3)     (5.3)    
Share-based compensation expense 4.1     4.1    
Ending balance (in shares) at Jun. 30, 2022   46,767,164        
Ending balance at Jun. 30, 2022 762.7 $ 0.5 (2,183.4) 513.1 2,433.3 (0.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 219.5       219.5  
Amortization of unrealized loss on interest rate hedge, net of tax 0.1         0.1
Cash dividends declared (7.5)       (7.5)  
Purchase of treasury stock (211.5)   (211.5)      
Issuance of treasury stock 0.1   0.9 (0.8)    
Amounts related to share-based compensation (2.1)     (2.1)    
Share-based compensation expense 4.7     4.7    
Ending balance (in shares) at Sep. 30, 2022   46,767,164        
Ending balance at Sep. 30, 2022 $ 766.0 $ 0.5 (2,394.0) 514.9 2,645.3 (0.7)
Beginning balance (in shares) at Dec. 31, 2022 46,767,164 46,767,164        
Beginning balance at Dec. 31, 2022 $ 640.7 $ 0.5 (2,633.3) 518.9 2,755.1 (0.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 106.3       106.3  
Amortization of unrealized loss on interest rate hedge, net of tax 0.2         0.2
Cash dividends declared (8.1)       (8.1)  
Dividend equivalent units accrued 0.0     0.1 (0.1)  
Purchase of treasury stock (13.7)   (13.7)      
Issuance of treasury stock 0.0   8.7 (8.7)    
Amounts related to share-based compensation (13.5)     (13.5)    
Share-based compensation expense 4.9     4.9    
Ending balance (in shares) at Mar. 31, 2023   46,767,164        
Ending balance at Mar. 31, 2023 $ 716.8 $ 0.5 (2,638.3) 501.7 2,853.2 (0.3)
Beginning balance (in shares) at Dec. 31, 2022 46,767,164 46,767,164        
Beginning balance at Dec. 31, 2022 $ 640.7 $ 0.5 (2,633.3) 518.9 2,755.1 (0.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income $ 406.8          
Ending balance (in shares) at Sep. 30, 2023 46,767,164 46,767,164        
Ending balance at Sep. 30, 2023 $ 844.1 $ 0.5 (2,795.9) 502.7 3,136.8 0.0
Beginning balance (in shares) at Mar. 31, 2023   46,767,164        
Beginning balance at Mar. 31, 2023 716.8 $ 0.5 (2,638.3) 501.7 2,853.2 (0.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 132.8       132.8  
Amortization of unrealized loss on interest rate hedge, net of tax 0.2         0.2
Cash dividends declared (8.2)       (8.2)  
Dividend equivalent units accrued 0.0     0.1 (0.1)  
Purchase of treasury stock (95.1)   (95.1)      
Issuance of treasury stock (0.1)   0.3 (0.4)    
Amounts related to share-based compensation (0.8)     (0.8)    
Share-based compensation expense 5.2     5.2    
Ending balance (in shares) at Jun. 30, 2023   46,767,164        
Ending balance at Jun. 30, 2023 750.8 $ 0.5 (2,733.1) 505.8 2,977.7 (0.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 167.7       167.7  
Amortization of unrealized loss on interest rate hedge, net of tax 0.1         0.1
Cash dividends declared (8.4)       (8.4)  
Dividend equivalent units accrued 0.0     0.2 (0.2)  
Purchase of treasury stock (65.3)   (65.3)      
Issuance of treasury stock (0.2)   2.5 (2.7)    
Amounts related to share-based compensation (6.3)     (6.3)    
Share-based compensation expense $ 5.7     5.7    
Ending balance (in shares) at Sep. 30, 2023 46,767,164 46,767,164        
Ending balance at Sep. 30, 2023 $ 844.1 $ 0.5 $ (2,795.9) $ 502.7 $ 3,136.8 $ 0.0