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Consolidated Statements of Shareholders' Equity - USD ($)
$ in Millions
Total
Cumulative Effect, Period of Adoption, Adjustment [Member]
Common Stock [Member]
Additional Paid-In Capital [Member]
Retained Earnings [Member]
Retained Earnings [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Treasury Stock [Member]
BALANCE, Shares at Dec. 31, 2017     102,562,149        
BALANCE, Amount at Dec. 31, 2017 $ 2,369.3 $ 10.1 $ 1.0 $ 4.0 $ 2,832.2 $ 10.1 $ (467.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 396.0       396.0    
Repurchases of common stock (100.0)           (100.0)
Stock-based compensation expense 25.5     25.5      
Shares awarded under stock-based compensation plans, net of shares withheld for taxes 15.1     (8.7)     23.8
BALANCE, Shares at Dec. 31, 2018     102,562,149        
BALANCE, Amount at Dec. 31, 2018 2,716.0   $ 1.0 20.8 3,238.3   (544.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 450.0       450.0    
Repurchases of common stock (44.7)           (44.7)
Stock-based compensation expense 31.1     31.1      
Shares awarded under stock-based compensation plans, net of shares withheld for taxes 9.7     (16.0)     25.7
BALANCE, Shares at Dec. 31, 2019     102,562,149        
BALANCE, Amount at Dec. 31, 2019 3,162.1 $ (0.5) $ 1.0 35.9 3,688.3 $ (0.5) (563.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 381.6       381.6    
Repurchases of common stock (382.3)           (382.3)
Stock-based compensation expense 30.2     30.2      
Shares awarded under stock-based compensation plans, net of shares withheld for taxes 44.6     (13.0)     57.6
BALANCE, Shares at Dec. 31, 2020     102,562,149        
BALANCE, Amount at Dec. 31, 2020 $ 3,235.7   $ 1.0 $ 53.1 $ 4,069.4   $ (887.8)