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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Millions
Common Stock
Treasury Stock
Additional paid-in capital
Retained earnings
Accumulated other comprehensive income (loss), net.
Total
Beginning balance at Dec. 31, 2020 $ 1.2 $ (1,250.4) $ 2,713.3 $ 1,809.8 $ 75.0 $ 3,348.9
Increase (Decrease) in Stockholders' Equity            
Cash dividends on common stock       (193.3)   (193.3)
Stock-based compensation 0.1   26.6     26.7
Repurchases of common stock from employee stock plans   (6.2)       (6.2)
Purchase of common stock   (81.3)       (81.3)
Retirement of treasury stock (0.2) 1,231.1 (1,230.9)      
Shares issued under employee stock purchase plan     0.4     0.4
Net income       529.0   529.0
Other comprehensive income (loss)         (19.4) (19.4)
Ending balance at Dec. 31, 2021 1.1 (106.8) 1,509.4 2,145.5 55.6 3,604.8
Increase (Decrease) in Stockholders' Equity            
Cash dividends on common stock       (209.4)   (209.4)
Stock-based compensation     30.7     30.7
Repurchases of common stock from employee stock plans   (8.9)       (8.9)
Purchase of common stock   (100.9)       (100.9)
Retirement of treasury stock   85.6 (85.6)      
Shares issued under employee stock purchase plan     0.6     0.6
Net income       235.0   235.0
Other comprehensive income (loss)         (86.6) (86.6)
Ending balance at Dec. 31, 2022 1.1 (131.0) 1,455.1 2,171.1 (31.0) 3,465.3
Increase (Decrease) in Stockholders' Equity            
Cash dividends on common stock       (223.5)   (223.5)
Stock-based compensation     41.3     41.3
Repurchases of common stock from employee stock plans   (13.9)       (13.9)
Purchase of common stock   (83.9)       (83.9)
Retirement of treasury stock   218.3 (34.5) (183.8)    
Shares issued under employee stock purchase plan     16.7     16.7
Net income       761.4   761.4
Other comprehensive income (loss)         21.6 21.6
Ending balance at Dec. 31, 2023 $ 1.1 $ (10.5) $ 1,478.6 $ 2,525.2 $ (9.4) $ 3,985.0