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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Millions
Total
Common Stock
Class A Common Stock
Common Stock
Common Stock
Capital in Excess of Par Value
Retained Earnings
Accumulated Other Comprehensive Loss
Treasury Stock
Balance at the beginning of period at Dec. 31, 2023   $ 130.1 $ 164.7 $ 578.2 $ 3,258.1   $ (2,202.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Conversion of Class A Common Stock   0.0 0.0 0.0      
Issuance of share units       (15.0)      
Vesting of share units       (1.9)     1.9
Share based compensation expense       11.3      
Exercises of stock options       11.0     6.3
Issuance of share based compensation       16.1      
Net earnings $ 423.9       423.9    
Dividends on stock         (141.0)    
Share incentives and directors' compensation             0.2
Shares repurchased             (237.1)
Excise tax on repurchases of common stock             (2.4)
Balance at end of period at Sep. 30, 2024 1,916.7 130.1 164.7 599.7 3,541.0 $ (85.2) (2,433.6)
Balance at the beginning of period at Jun. 30, 2024   130.1 164.7 593.1 3,467.6   (2,351.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Conversion of Class A Common Stock   0.0 0.0 0.0      
Issuance of share units       0.0      
Vesting of share units       (0.1)     0.0
Share based compensation expense       1.9      
Exercises of stock options       4.7     3.1
Issuance of share based compensation       0.1      
Net earnings 120.1       120.1    
Dividends on stock         (46.7)    
Share incentives and directors' compensation             0.0
Shares repurchased             (83.9)
Excise tax on repurchases of common stock             (0.9)
Balance at end of period at Sep. 30, 2024 1,916.7 130.1 164.7 599.7 3,541.0 (85.2) (2,433.6)
Balance at the beginning of period at Dec. 31, 2024 1,883.5 130.1 164.7 601.3 3,601.3   (2,502.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Conversion of Class A Common Stock   (0.1) 0.0 0.1      
Issuance of share units       (15.0)      
Vesting of share units       (1.8)     1.8
Share based compensation expense       10.8      
Exercises of stock options       1.1     (0.4)
Issuance of share based compensation       15.9      
Net earnings 420.8       420.8    
Dividends on stock         (145.4)    
Share incentives and directors' compensation             0.3
Shares repurchased             (335.4)
Excise tax on repurchases of common stock             (3.3)
Balance at end of period at Sep. 30, 2025 1,844.5 130.0 164.7 612.4 3,876.7 (100.3) (2,839.0)
Balance at the beginning of period at Jun. 30, 2025   130.0 164.7 609.4 3,792.5   (2,754.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Conversion of Class A Common Stock   0.0 0.0 0.0      
Issuance of share units       (2.3)      
Vesting of share units       0.0     0.0
Share based compensation expense       2.5      
Exercises of stock options       0.5     0.7
Issuance of share based compensation       2.3      
Net earnings 132.0       132.0    
Dividends on stock         (47.8)    
Share incentives and directors' compensation             0.0
Shares repurchased             (84.1)
Excise tax on repurchases of common stock             (0.8)
Balance at end of period at Sep. 30, 2025 $ 1,844.5 $ 130.0 $ 164.7 $ 612.4 $ 3,876.7 $ (100.3) $ (2,839.0)