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Stockholders' Equity (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Feb. 07, 2018
Dec. 31, 2021
Feb. 13, 2017
Dividends, Common Stock [Abstract]                
Stock Repurchase Program, Authorized Amount               $ 300.0
Stock Repurchase Program, Period in Force           3 years    
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 166.5     $ 166.5        
Payment, Tax Withholding, Share-based Payment Arrangement $ 0.4   $ 5.4 $ 29.2 $ 34.0      
Preferred Stock, Shares Authorized 100.0     100.0     100.0  
Preferred Stock, Shares Issued 0.0     0.0     0.0  
Preferred Stock, Shares Outstanding 0.0     0.0     0.0  
Common Stock, Dividends, Per Share, Cash Paid $ 0.095              
Stock Repurchase Program, $ 133.5     $ 133.5        
Restricted Stock Units (RSUs)                
Dividends, Common Stock [Abstract]                
Vesting of restricted stock units 0.1   0.1 0.8 1.1      
Dividend Paid                
Dividends, Common Stock [Abstract]                
Dividends, Common Stock, Cash $ 18.3 $ 18.3