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Stockholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 9 Months Ended 12 Months Ended
Feb. 29, 2020
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 23, 2020
Feb. 25, 2019
Mar. 31, 2018
Mar. 31, 2017
Accelerated Share Repurchases [Line Items]                  
Cash dividends declared and paid per common share (in dollars per share)   $ 0.16 $ 0.63 $ 0.60 $ 0.56        
Common stock, shares authorized (in shares)   150,000,000 150,000,000 150,000,000          
Common stock, par value (in dollars per share)   $ 0.01 $ 0.01 $ 0.01          
Common stock, shares outstanding (in shares)   75,471,562 75,471,562 76,536,755          
Shares available for grant (in shares)   3,581,614 3,581,614            
Purchases and retirement of common stock     $ 130.0 $ 184.3 $ 0.0        
Remaining authorized repurchase amount   $ 300.0 300.0            
Common stock, quarterly dividends declared (in dollars per share)             $ 0.15 $ 0.15 $ 0.14
Accelerated Share Repurchase                  
Accelerated Share Repurchases [Line Items]                  
Purchases and retirement of common stock     $ 130.0 $ 184.3          
Purchases and retirement of common stock (in shares)     1,794,256 3,120,184          
Subsequent Event [Member]                  
Accelerated Share Repurchases [Line Items]                  
Common stock, quarterly dividends declared (in dollars per share)           $ 0.16      
Subsequent Event [Member] | Accelerated Share Repurchase                  
Accelerated Share Repurchases [Line Items]                  
Purchases and retirement of common stock $ 25.0                
Purchases and retirement of common stock (in shares) 297,000