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Stockholders' Equity (Details)
 2 Months Ended
Apr. 26, 2016
$ / shares
Apr. 19, 2016
shares
Feb. 22, 2016
shares
Jan. 19, 2016
$ / shares
shares
Nov. 13, 2015
USD ($)
shares
Oct. 30, 2015
dividend
$ / shares
Apr. 19, 2016
$ / shares
shares
Jan. 20, 2016
shares
Mar. 31, 2016
USD ($)
$ / shares
Feb. 17, 2016
USD ($)
Dec. 31, 2015
$ / shares
Sep. 30, 2015
USD ($)
Aug. 20, 2014
USD ($)
Aug. 17, 2012
$ / shares
Class of Stock [Line Items]                            
Authorized repurchase amount | $         $ 400,000,000         $ 400,000,000   $ 1,200,000,000    
Authorized amount for accelerated stock repurchase program | $         $ 400,000,000         $ 400,000,000        
Accelerated shares repurchased, number of shares purchased (shares) | shares     4,222,193 970,609 4,140,788     5,111,397            
Average price per share paid for stock repurchased for accelerated stock repurchases (in dollars per share)       $ 78.26                    
Number of dividends declared | dividend           2                
Dividend declared (in dollars per share)           $ 2.00                
Common stock, par value (in dollars per share)                 $ 0.01   $ 0.01     $ 0.01
Maximum price of common stock available to be issued | $                 $ 500,000       $ 500,000,000  
Commission to sales agent (as a percent)                           2.00%
Subsequent event                            
Class of Stock [Line Items]                            
Accelerated shares repurchased, number of shares purchased (shares) | shares   861,235         5,083,428              
Average price per share paid for stock repurchased for accelerated stock repurchases (in dollars per share)             $ 78.69              
Dividend declared (in dollars per share) $ 0.68