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Stockholders' Equity (Details)
 2 Months Ended
Jul. 11, 2016
shares
May 09, 2016
USD ($)
shares
Apr. 19, 2016
shares
Feb. 17, 2016
USD ($)
shares
Jan. 19, 2016
shares
Nov. 12, 2015
USD ($)
shares
Oct. 30, 2015
dividend
$ / shares
Jul. 11, 2016
$ / shares
shares
Apr. 19, 2016
$ / shares
shares
Jan. 19, 2016
$ / shares
shares
Sep. 30, 2016
USD ($)
$ / shares
Dec. 31, 2015
$ / shares
Sep. 30, 2015
USD ($)
Aug. 20, 2014
USD ($)
$ / shares
Stockholders' Equity Note [Abstract]                            
Authorized repurchase amount | $   $ 400,000,000   $ 400,000,000   $ 400,000,000             $ 1,200,000,000  
Authorized amount for accelerated stock repurchase program | $   $ 400,000,000   $ 400,000,000   $ 400,000,000                
Accelerated shares repurchased (shares) | shares 1,104,162 3,964,812 861,235 4,222,193 970,609 4,140,788   5,068,974.000 5,083,428 5,111,397        
Average price per share paid for stock repurchased for accelerated stock repurchases (in dollars per share) | $ / shares               $ 78.91 $ 78.69 $ 78.26        
Number of dividends declared | dividend             2              
Dividend declared (in dollars per share) | $ / shares             $ 2.00              
Common stock, par value (in dollars per share) | $ / shares                     $ 0.01 $ 0.01   $ 0.01
Maximum price of common stock available to be issued | $                     $ 500,000,000     $ 500,000,000
Commission to sales agent (as a percent)                           2.00%