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Unaudited Condensed Consolidated Statement Of Shareholders' Equity - USD ($)
$ in Millions
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Retained Earnings [Member]
Treasury Stock [Member]
BALANCE at period start (in shares) at Dec. 31, 2020   102,562,149      
BALANCE at period start 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 239.4     239.4  
Repurchases of common stock (306.1)       (306.1)
Stock-based compensation expense 20.8   20.8    
Shares awarded under stock-based compensation plans, net of shares withheld for taxes 4.1   (32.9)   37.0
BALANCE at period end (in shares) at Mar. 31, 2021   102,562,149      
BALANCE at period end at Mar. 31, 2021 3,193.9 $ 1.0 41.0 4,308.8 (1,156.9)
BALANCE at period start (in shares) at Dec. 31, 2021   86,562,149      
BALANCE at period start 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 362.1     362.1  
Repurchases of common stock (380.9)       (380.9)
Stock-based compensation expense 15.9   15.9    
Shares awarded under stock-based compensation plans, net of shares withheld for taxes (28.5)   (16.7) (58.1) 46.3
BALANCE at period end (in shares) at Mar. 31, 2022   86,562,149      
BALANCE at period end at Mar. 31, 2022 $ 2,345.6 $ 0.8 $ 2.4 $ 4,943.9 $ (2,601.5)