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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Millions, $ in Millions
Total
Cumulative Effect, Period of Adoption, Adjustment
Common Stock
Other Capital
Treasury Stock
(Accumulated Deficit) Retained Earnings
(Accumulated Deficit) Retained Earnings
Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Dec. 31, 2017     73.6          
Beginning balance at Dec. 31, 2017 $ 102.4 $ 37.6 $ 7.4 $ 503.1 $ (64.5) $ (71.0) $ 37.6 $ (272.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 137.3         137.3    
Other comprehensive income, net of income taxes 33.2             33.2
Contribution of treasury stock to retirement benefit plan (in shares)     2.7          
Contribution of treasury stock to retirement benefit plan 95.0   $ 0.3 42.9 51.8      
Repurchase of shares for option cost and to satisfy tax withholding obligations (3.3)     (3.3)        
Stock-based compensation and shares issued under equity plans, net (in shares)     0.5          
Stock-based compensation and shares issued under equity plans, net 19.1     19.1        
Ending balance (in shares) at Dec. 31, 2018     76.8          
Ending balance at Dec. 31, 2018 421.3   $ 7.7 561.8 (12.7) 103.9   (239.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 141.0         141.0    
Other comprehensive income, net of income taxes 2.9             2.9
Repurchase of shares for option cost and to satisfy tax withholding obligations (in shares)     (0.3)          
Repurchase of shares for option cost and to satisfy tax withholding obligations (8.5)     (8.5)        
Stock-based compensation and shares issued under equity plans, net (in shares)     0.8          
Stock-based compensation and shares issued under equity plans, net 20.0     20.0        
Ending balance (in shares) at Dec. 31, 2019     77.3          
Ending balance at Dec. 31, 2019 576.7   $ 7.7 573.3 (12.7) 244.9   (236.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 137.7         137.7    
Other comprehensive income, net of income taxes 8.9             8.9
Cash dividends declared ($5.00 per share) $ (447.8)         (447.8)    
Purchase of treasury stock (in shares) (1.3)   (1.3)          
Purchase of treasury stock $ (51.7)       (51.7)      
Repurchase of shares for option cost and to satisfy tax withholding obligations (in shares)     (0.3)          
Repurchase of shares for option cost and to satisfy tax withholding obligations (20.0)     (20.0)        
Stock-based compensation and shares issued under equity plans, net (in shares)     1.1          
Stock-based compensation and shares issued under equity plans, net 29.7     29.7        
Ending balance (in shares) at Dec. 31, 2020     76.8          
Ending balance at Dec. 31, 2020 $ 233.5   $ 7.7 $ 583.0 $ (64.4) $ (65.2)   $ (227.6)