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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($)
$ in Millions
Total
Common Stock [Member]
Treasury Stock
Additional Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Beginning Balance at Dec. 31, 2023 $ 3,855.4 $ 293.7 $ (2,878.2) $ 454.8 $ 6,012.3 $ (27.2)
Beginning Balance (in shares) at Dec. 31, 2023   293,700,000        
Beginning Balance (in shares) at Dec. 31, 2023     (50,600,000)      
Net income 227.7 $ 0.0 $ 0.0 0.0 227.7 0.0
Other comprehensive income (loss) (2.1) 0.0 0.0 0.0 0.0 (2.1)
Cash dividends (69.0) 0.0 0.0 0.0 (69.0) 0.0
Stock based compensation expense and stock option plan transactions 88.7 $ 0.0 $ 45.4 43.5 (0.2) 0.0
Stock based compensation expense and stock option plan transactions (in shares)   0 1,400,000      
Ending Balance at Mar. 31, 2024 4,100.7 $ 293.7 $ (2,832.8) 498.3 6,170.8 (29.3)
Ending Balance (in shares) at Mar. 31, 2024   293,700,000        
Ending Balance (in shares) at Mar. 31, 2024     (49,200,000)      
Beginning Balance at Dec. 31, 2023 3,855.4 $ 293.7 $ (2,878.2) 454.8 6,012.3 (27.2)
Beginning Balance (in shares) at Dec. 31, 2023   293,700,000        
Beginning Balance (in shares) at Dec. 31, 2023     (50,600,000)      
Net income 396.1          
Other comprehensive income (loss) 9.0          
Ending Balance at Sep. 30, 2024 4,193.7 $ 293.7 $ (2,817.4) 534.7 6,200.9 (18.2)
Ending Balance (in shares) at Sep. 30, 2024   293,700,000        
Ending Balance (in shares) at Sep. 30, 2024     (48,600,000)      
Beginning Balance at Mar. 31, 2024 4,100.7 $ 293.7 $ (2,832.8) 498.3 6,170.8 (29.3)
Beginning Balance (in shares) at Mar. 31, 2024   293,700,000        
Beginning Balance (in shares) at Mar. 31, 2024     (49,200,000)      
Net income 243.5 $ 0.0 $ 0.0 0.0 243.5 0.0
Other comprehensive income (loss) 0.2 0.0 0.0 0.0 0.0 0.2
Cash dividends (69.2) 0.0 0.0 0.0 (69.2) 0.0
Stock based compensation expense and stock option plan transactions 30.3 $ 0.0 $ 9.8 20.4 0.1 0.0
Stock based compensation expense and stock option plan transactions (in shares)   0 300,000      
Ending Balance at Jun. 30, 2024 4,305.5 $ 293.7 $ (2,823.0) 518.7 6,345.2 (29.1)
Ending Balance (in shares) at Jun. 30, 2024   293,700,000        
Ending Balance (in shares) at Jun. 30, 2024     (48,900,000)      
Net income (75.1) $ 0.0 $ 0.0 0.0 (75.1) 0.0
Other comprehensive income (loss) 10.9 0.0 0.0 0.0 0.0 10.9
Cash dividends (69.2) 0.0 0.0 0.0 (69.2) 0.0
Stock based compensation expense and stock option plan transactions 21.6 $ 0.0 $ 5.6 16.0 0.0 0.0
Stock based compensation expense and stock option plan transactions (in shares)   0 300,000      
Ending Balance at Sep. 30, 2024 4,193.7 $ 293.7 $ (2,817.4) 534.7 6,200.9 (18.2)
Ending Balance (in shares) at Sep. 30, 2024   293,700,000        
Ending Balance (in shares) at Sep. 30, 2024     (48,600,000)      
Beginning Balance at Dec. 31, 2024 $ 4,360.8 $ 293.7 $ (2,784.8) 563.1 6,319.7 (30.9)
Beginning Balance (in shares) at Dec. 31, 2024   293,700,000        
Beginning Balance (in shares) at Dec. 31, 2024 47,830,141   (47,800,000)      
Net income $ 220.1 $ 0.0 $ 0.0 0.0 220.1 0.0
Other comprehensive income (loss) 4.8 0.0 0.0 0.0 0.0 4.8
Cash dividends (72.4) 0.0 0.0 0.0 (72.4) 0.0
Stock based compensation expense and stock option plan transactions 37.7 $ 0.0 $ 10.7 27.2 (0.2) 0.0
Stock based compensation expense and stock option plan transactions (in shares)   0 300,000      
Ending Balance at Mar. 31, 2025 4,551.0 $ 293.7 $ (2,774.1) 590.3 6,467.2 (26.1)
Ending Balance (in shares) at Mar. 31, 2025   293,700,000        
Ending Balance (in shares) at Mar. 31, 2025     (47,500,000)      
Beginning Balance at Dec. 31, 2024 $ 4,360.8 $ 293.7 $ (2,784.8) 563.1 6,319.7 (30.9)
Beginning Balance (in shares) at Dec. 31, 2024   293,700,000        
Beginning Balance (in shares) at Dec. 31, 2024 47,830,141   (47,800,000)      
Ending Balance at Jun. 30, 2025 $ 4,393.7 $ 293.7 $ (3,039.5) 572.5 6,585.4 (18.4)
Ending Balance (in shares) at Jun. 30, 2025   293,700,000        
Ending Balance (in shares) at Jun. 30, 2025     (50,200,000)      
Beginning Balance at Dec. 31, 2024 $ 4,360.8 $ 293.7 $ (2,784.8) 563.1 6,319.7 (30.9)
Beginning Balance (in shares) at Dec. 31, 2024   293,700,000        
Beginning Balance (in shares) at Dec. 31, 2024 47,830,141   (47,800,000)      
Net income $ 593.3          
Other comprehensive income (loss) $ 10.9          
Stock purchases (in shares) 3,200,000          
Stock purchases $ 300.0          
Ending Balance at Sep. 30, 2025 $ 4,223.0 $ 293.7 $ (3,366.3) 619.6 6,696.0 (20.0)
Ending Balance (in shares) at Sep. 30, 2025   293,700,000        
Ending Balance (in shares) at Sep. 30, 2025 53,610,212   (53,600,000)      
Beginning Balance at Mar. 31, 2025 $ 4,551.0 $ 293.7 $ (2,774.1) 590.3 6,467.2 (26.1)
Beginning Balance (in shares) at Mar. 31, 2025   293,700,000        
Beginning Balance (in shares) at Mar. 31, 2025     (47,500,000)      
Net income 191.0 $ 0.0 $ 0.0 0.0 191.0 0.0
Other comprehensive income (loss) 7.7 0.0 0.0 0.0 0.0 7.7
Cash dividends (72.6) $ 0.0 $ 0.0 0.0 (72.6) 0.0
Stock purchases (in shares)   0 (2,800,000)      
Stock purchases (300.0) $ 0.0 $ (270.0) (30.0) 0.0 0.0
Stock based compensation expense and stock option plan transactions 16.6 $ 0.0 $ 4.6 12.2 (0.2) 0.0
Stock based compensation expense and stock option plan transactions (in shares)   0 100,000      
Ending Balance at Jun. 30, 2025 4,393.7 $ 293.7 $ (3,039.5) 572.5 6,585.4 (18.4)
Ending Balance (in shares) at Jun. 30, 2025   293,700,000        
Ending Balance (in shares) at Jun. 30, 2025     (50,200,000)      
Net income 182.2 $ 0.0 $ 0.0 0.0 182.2 0.0
Other comprehensive income (loss) (1.6) 0.0 0.0 0.0 0.0 (1.6)
Cash dividends (71.4) $ 0.0 $ 0.0 0.0 (71.4) 0.0
Stock purchases (in shares)   0 (3,500,000)      
Stock purchases (300.0) $ 0.0 $ 330.0 (30.0) 0.0 0.0
Stock based compensation expense and stock option plan transactions 20.1 $ 0.0 $ 3.2 17.1 (0.2) 0.0
Stock based compensation expense and stock option plan transactions (in shares)   0 100,000      
Ending Balance at Sep. 30, 2025 $ 4,223.0 $ 293.7 $ (3,366.3) $ 619.6 $ 6,696.0 $ (20.0)
Ending Balance (in shares) at Sep. 30, 2025   293,700,000        
Ending Balance (in shares) at Sep. 30, 2025 53,610,212   (53,600,000)