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Stockholders' Equity (Narrative) (Details) - USD ($)
 2 Months Ended 12 Months Ended
Feb. 26, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jan. 28, 2016
Accelerated Share Repurchases [Line Items]          
Common stock, shares authorized   150,000,000 150,000,000    
Common stock, par value   $ 0.01 $ 0.01    
Common stock, shares outstanding   83,814,809 89,146,093    
Shares available for grant   4,311,886      
Authorized amount   $ 287,500,000 $ 499,700,000 $ 1,000,000  
Remaining authorized repurchase amount   $ 244,200,000      
Common stock, quarterly dividends paid (in dollars per share)   $ 0.12 $ 0.11 $ 0.10  
July 2012 Share Repurchase Program          
Accelerated Share Repurchases [Line Items]          
Authorized amount (in shares)   $ 50,000,000.0      
December 2013 ASR Program          
Accelerated Share Repurchases [Line Items]          
Authorized amount (in shares)       $ 500,000,000  
December 2014 ASR Program          
Accelerated Share Repurchases [Line Items]          
Authorized amount (in shares)     $ 500,000,000    
Accelerated Share Repurchase          
Accelerated Share Repurchases [Line Items]          
Authorized amount   $ 287,500,000 $ 415,000,000    
Purchases and retirement of common stock, shares   5,541,930 8,248,183    
Open Market Transaction          
Accelerated Share Repurchases [Line Items]          
Authorized amount     $ 84,700,000 $ 1,000,000  
Purchases and retirement of common stock, shares     1,818,139 100,000.0  
Purchases and retirement of common stock, average price (in dollars per share)     $ 46.60 $ 49.34  
Subsequent Event          
Accelerated Share Repurchases [Line Items]          
Common stock, quarterly dividends declared (in dollars per share)         $ 0.13
Subsequent Event | Accelerated Share Repurchase          
Accelerated Share Repurchases [Line Items]          
Authorized amount $ 60,000,000        
Purchases and retirement of common stock, shares 974,619