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Stockholders' Equity (Narrative) (Details) - USD ($)
 2 Months Ended 12 Months Ended
Feb. 28, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Feb. 25, 2019
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
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)   76,536,755 79,465,393          
Shares available for grant (in shares)   3,436,426            
Purchases and retirement of common stock   $ 184,300,000 $ 0 $ 212,500,000        
Remaining authorized repurchase amount   147,100,000            
Stock Repurchase Program, Authorized Amount, Year Two   31,400,000            
Common stock, quarterly dividends declared (in dollars per share)           $ 0.15 $ 0.14 $ 0.13
2012, 2013, 2014 and 2016 Share Repurchase Program [Member]                
Accelerated Share Repurchases [Line Items]                
Authorized amount   $ 1,350,000,000            
Accelerated Share Repurchase                
Accelerated Share Repurchases [Line Items]                
Purchases and retirement of common stock     $ 184,300,000 $ 212,500,000        
Purchases and retirement of common stock (in shares)   3,120,184 70,464 4,413,250        
December 2016 ASR Program                
Accelerated Share Repurchases [Line Items]                
Stock Repurchase Program, Authorized Amount, Next Twelve Months   $ 115,700,000            
Subsequent Event [Member]                
Accelerated Share Repurchases [Line Items]                
Common stock, quarterly dividends declared (in dollars per share)         $ 0.15      
Subsequent Event [Member] | Accelerated Share Repurchase                
Accelerated Share Repurchases [Line Items]                
Purchases and retirement of common stock $ 30,000,000              
Purchases and retirement of common stock (in shares) 379,927