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CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY - USD ($)
$ in Millions
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Treasury Stock
Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2023   42,352,001        
Beginning balance at Dec. 31, 2023 $ 3,244.1 $ 0.4 $ 1,288.4 $ 2,961.5 $ (1,067.3) $ 61.1
Treasury stock, beginning balance (in shares) at Dec. 31, 2023         22,018,537  
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 147.1     147.1    
Change in fair value of cash flow swaps, net of reclassification adjustment 7.5         7.5
Unrealized gain on changes in fair value of debt securities, net of reclassification adjustment and tax expense (2.2)         (2.2)
Comprehensive income 152.4     147.1   5.3
Share-based compensation $ 10.5   10.5      
Issuance of common stock, net of forfeitures in connection with share-based payment arrangements (in shares)   123,845        
Shares repurchased (in shares) 239,790       239,790  
Share repurchases $ (50.4)       $ (50.4)  
Repurchase of common stock associated with net share settlements of employee share-based awards (in shares)         45,399  
Repurchase of common stock associated with net share settlement of employee share-based awards (9.8)       $ (9.8)  
Repurchase and retirement of common stock (in shares)   (239,790)     (239,790)  
Retirement of common stock 0.0   (2.9) (47.1) $ 50.0  
Ending balance (in shares) at Mar. 31, 2024   42,236,056        
Ending balance at Mar. 31, 2024 3,346.9 $ 0.4 1,296.1 3,061.5 $ (1,077.5) 66.4
Treasury stock, ending balance (in shares) at Mar. 31, 2024         22,063,936  
Beginning balance (in shares) at Dec. 31, 2024   41,649,426        
Beginning balance at Dec. 31, 2024 $ 3,502.1 $ 0.4 1,305.1 3,218.9 $ (1,079.2) 56.8
Treasury stock, beginning balance (in shares) at Dec. 31, 2024 22,065,478       22,065,478  
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income $ 132.1     132.1    
Change in fair value of cash flow swaps, net of reclassification adjustment (10.3)         (10.3)
Unrealized gain on changes in fair value of debt securities, net of reclassification adjustment and tax expense 3.0         3.0
Comprehensive income 124.9     132.1   (7.2)
Share-based compensation $ 9.1   9.1      
Issuance of common stock, net of forfeitures in connection with share-based payment arrangements (in shares)   117,992        
Shares repurchased (in shares) 0          
Repurchase of common stock associated with net share settlements of employee share-based awards (in shares)         42,780  
Repurchase of common stock associated with net share settlement of employee share-based awards $ (12.5)       $ (12.5)  
Ending balance (in shares) at Mar. 31, 2025   41,767,418        
Ending balance at Mar. 31, 2025 $ 3,623.5 $ 0.4 $ 1,314.2 $ 3,351.0 $ (1,091.7) $ 49.6
Treasury stock, ending balance (in shares) at Mar. 31, 2025 22,108,258       22,108,258