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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, 2021 $ 3,233.2 $ 292.8 $ (2,667.7) $ 310.3 $ 5,366.0 $ (68.2)
Beginning Balance (in shares) at Dec. 31, 2021   292.8 (50.3)      
Net income 204.4 $ 0.0 $ 0.0 0.0 204.4 0.0
Other comprehensive income (loss) 15.0 0.0 0.0 0.0 0.0 15.0
Cash dividends (63.7) 0.0 0.0 0.0 (63.7) 0.0
Stock purchases 0.0 $ 0.0 $ (20.0) 20.0 0.0 0.0
Stock purchases (in shares)   0 (0.2)      
Stock based compensation expense and stock option plan transactions 14.0 $ 0.0 $ 10.1 3.9 0.0 0.0
Stock based compensation expense and stock option plan transactions (in shares)   0 0.3      
Ending Balance at Mar. 31, 2022 3,402.9 $ 292.8 $ (2,677.6) 334.2 5,506.7 (53.2)
Ending Balance (in shares) at Mar. 31, 2022   292.8 (50.2)      
Beginning Balance at Dec. 31, 2021 3,233.2 $ 292.8 $ (2,667.7) 310.3 5,366.0 (68.2)
Beginning Balance (in shares) at Dec. 31, 2021   292.8 (50.3)      
Net income 578.6          
Other comprehensive income (loss) 22.1          
Ending Balance at Sep. 30, 2022 3,687.8 $ 292.8 $ (2,668.2) 355.9 5,753.4 (46.1)
Ending Balance (in shares) at Sep. 30, 2022   292.8 (49.9)      
Beginning Balance at Mar. 31, 2022 3,402.9 $ 292.8 $ (2,677.6) 334.2 5,506.7 (53.2)
Beginning Balance (in shares) at Mar. 31, 2022   292.8 (50.2)      
Net income 187.1 $ 0.0 $ 0.0 0.0 187.1 0.0
Other comprehensive income (loss) 6.1 0.0 0.0 0.0 0.0 6.1
Cash dividends (63.7) 0.0 0.0 0.0 (63.7) 0.0
Stock based compensation expense and stock option plan transactions 22.0 $ 0.0 $ 6.1 15.9 0.0 0.0
Stock based compensation expense and stock option plan transactions (in shares)   0 0.2      
Ending Balance at Jun. 30, 2022 3,554.4 $ 292.8 $ (2,671.5) 350.1 5,630.1 (47.1)
Ending Balance (in shares) at Jun. 30, 2022   292.8 (50)      
Net income 187.1 $ 0.0 $ 0.0 0.0 187.1 0.0
Other comprehensive income (loss) 1.0 0.0 0.0 0.0 0.0 (1.0)
Cash dividends (63.8) 0.0 0.0 0.0 (63.8) 0.0
Stock based compensation expense and stock option plan transactions 9.1 $ 0.0 $ 3.3 5.8 0.0 0.0
Stock based compensation expense and stock option plan transactions (in shares)   0 0.1      
Ending Balance at Sep. 30, 2022 3,687.8 $ 292.8 $ (2,668.2) 355.9 5,753.4 (46.1)
Ending Balance (in shares) at Sep. 30, 2022   292.8 (49.9)      
Beginning Balance at Dec. 31, 2022 3,489.9 $ 293.7 $ (2,665.3) 366.2 5,524.6 (29.3)
Beginning Balance (in shares) at Dec. 31, 2022   293.7 (49.8)      
Net income 203.2 $ 0.0 $ 0.0 0.0 203.2 0.0
Other comprehensive income (loss) 3.1 0.0 0.0 0.0 0.0 3.1
Cash dividends (66.3) 0.0 0.0 0.0 (66.3) 0.0
Stock based compensation expense and stock option plan transactions 37.8 $ 0.0 $ 10.3 27.8 (0.3) 0.0
Stock based compensation expense and stock option plan transactions (in shares)   0 0.3      
Ending Balance at Mar. 31, 2023 3,667.7 $ 293.7 $ (2,655.0) 394.0 5,661.2 (26.2)
Ending Balance (in shares) at Mar. 31, 2023   293.7 (49.5)      
Beginning Balance at Dec. 31, 2022 3,489.9 $ 293.7 $ (2,665.3) 366.2 5,524.6 (29.3)
Beginning Balance (in shares) at Dec. 31, 2022   293.7 (49.8)      
Net income 601.9          
Other comprehensive income (loss) (0.1)          
Ending Balance at Sep. 30, 2023 4,050.5 $ 293.7 $ (2,581.1) 441.4 5,925.9 (29.4)
Ending Balance (in shares) at Sep. 30, 2023   293.7 (47.4)      
Beginning Balance at Mar. 31, 2023 3,667.7 $ 293.7 $ (2,655.0) 394.0 5,661.2 (26.2)
Beginning Balance (in shares) at Mar. 31, 2023   293.7 (49.5)      
Net income 221.2 $ 0.0 $ 0.0 0.0 221.2 0.0
Other comprehensive income (loss) (1.6) 0.0 0.0 0.0 0.0 (1.6)
Cash dividends (66.7) 0.0 0.0 0.0 (66.7) 0.0
Stock based compensation expense and stock option plan transactions 90.4 $ 0.0 $ 62.2 28.6 (0.4) 0.0
Stock based compensation expense and stock option plan transactions (in shares)   0 1.8      
Ending Balance at Jun. 30, 2023 3,911.0 $ 293.7 $ (2,592.8) 422.6 5,815.3 (27.8)
Ending Balance (in shares) at Jun. 30, 2023   293.7 (47.7)      
Net income 177.5 $ 0.0 $ 0.0 0.0 177.5 0.0
Other comprehensive income (loss) (1.6) 0.0 0.0 0.0 0.0 (1.6)
Cash dividends (66.9) 0.0 0.0 0.0 (66.9) 0.0
Stock based compensation expense and stock option plan transactions 30.5 $ 0.0 $ 11.7 18.8 0.0 0.0
Stock based compensation expense and stock option plan transactions (in shares)   0 0.3      
Ending Balance at Sep. 30, 2023 $ 4,050.5 $ 293.7 $ (2,581.1) $ 441.4 $ 5,925.9 $ (29.4)
Ending Balance (in shares) at Sep. 30, 2023   293.7 (47.4)