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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($)
$ in Millions
Total
Common Stock
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)     1,400,000      
Ending Balance (in shares) at Mar. 31, 2024     (49,200,000)      
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        
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)     300,000      
Ending Balance (in shares) at Mar. 31, 2025 47,481,238   (47,500,000)      
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