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Stockholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Jan. 19, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accelerated Share Repurchases [Line Items]        
Common stock, shares authorized (in shares)   150,000,000 150,000,000  
Common stock, par value (in dollars per share)   $ 0.01 $ 0.01  
Common stock, shares outstanding (in shares)   74,441,312 74,962,231  
Shares available for grant (in shares)   4,000,968    
Purchases and retirement of common stock   $ 135.0 $ 55.0 $ 130.0
Remaining authorized repurchase amount   $ 110.0    
Accelerated share repurchase        
Accelerated Share Repurchases [Line Items]        
Purchases and retirement of common stock (in shares)   952,204 970,141  
Purchases and retirement of common stock   $ 135.0 $ 55.0  
Accelerated share repurchase | Subsequent event        
Accelerated Share Repurchases [Line Items]        
Purchases and retirement of common stock (in shares) 113,824