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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Millions, $ in Millions
Total
Common Stock
Capital Surplus
Accumulated Deficit
Accumulated Other Comprehensive Loss
Beginning balance at Dec. 31, 2020 $ 186.6 $ 4.1 $ 885.1 $ (543.1) $ (159.5)
Beginning balance (shares) at Dec. 31, 2020   411.2      
Increase/(Decrease) in Stockholders' Equity [Roll Forward]          
Net income 805.8     805.8  
Stock-based compensation 44.3   44.3    
Common stock dividends and dividend equivalents declared (384.8)     (384.8)  
Repurchase and retirement of common shares (415.3) $ (0.2)   (415.1)  
Repurchase and retirement of common shares (shares)   (20.1)      
Shares issued under stock-based compensation plans 11.6   11.6    
Shares issued under stock-based compensation plans (shares)   2.7      
Other comprehensive income/(loss) (Note 13) 107.4       107.4
Ending balance at Dec. 31, 2021 355.6 $ 3.9 941.0 (537.2) (52.1)
Ending balance (shares) at Dec. 31, 2021   393.8      
Increase/(Decrease) in Stockholders' Equity [Roll Forward]          
Net income 910.6     910.6  
Stock-based compensation 45.5   45.5    
Common stock dividends and dividend equivalents declared (363.0)     (363.0)  
Repurchase and retirement of common shares (364.6) $ (0.3)   (364.3)  
Repurchase and retirement of common shares (shares)   (23.0)      
Shares issued under stock-based compensation plans 9.5 $ 0.1 9.4    
Shares issued under stock-based compensation plans (shares)   2.7      
Other comprehensive income/(loss) (Note 13) (115.8)       (115.8)
Ending balance at Dec. 31, 2022 $ 477.8 $ 3.7 995.9 (353.9) (167.9)
Ending balance (shares) at Dec. 31, 2022 373.5 373.5      
Increase/(Decrease) in Stockholders' Equity [Roll Forward]          
Net income $ 626.0     626.0  
Stock-based compensation 35.9   35.9    
Common stock dividends and dividend equivalents declared (350.3)     (350.3)  
Repurchase and retirement of common shares (311.2) $ (0.3)   (310.9)  
Repurchase and retirement of common shares (shares)   (24.9)      
Shares issued under stock-based compensation plans 0.2 $ 0.1 0.1    
Shares issued under stock-based compensation plans (shares)   1.9      
Other comprehensive income/(loss) (Note 13) 0.6       0.6
Ending balance at Dec. 31, 2023 $ 479.0 $ 3.5 $ 1,031.9 $ (389.1) $ (167.3)
Ending balance (shares) at Dec. 31, 2023 350.5 350.5