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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, 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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 1,373.0       1,373.0    
Repurchases of common stock (2,303.2)           (2,303.2)
Treasury stock cancellation, Shares     (16,000,000)        
Treasury stock cancellation     $ (0.2) (40.6) (797.2)   838.0
Stock-based compensation expense 35.0     35.0      
Shares awarded under stock-based compensation plans, net of shares withheld for taxes 36.5     (44.3) (5.3)   86.1
BALANCE, Shares at Dec. 31, 2021     86,562,149        
BALANCE, Amount at Dec. 31, 2021 2,377.0   $ 0.8 3.2 4,639.9   (2,266.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 1,377.4       1,377.4    
Repurchases of common stock (1,710.2)           (1,710.2)
Treasury stock cancellation, Shares     (23,000,000)        
Treasury stock cancellation 0.0   $ (0.2) (7.8) (2,295.5)   2,303.5
Stock-based compensation expense 31.5     31.5      
Shares awarded under stock-based compensation plans, net of shares withheld for taxes (27.9)     (23.8) (58.1)   54.0
BALANCE, Shares at Dec. 31, 2022     63,562,149        
BALANCE, Amount at Dec. 31, 2022 $ 2,047.8   $ 0.6 $ 3.1 $ 3,663.7   $ (1,619.6)