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Stockholders' Equity (Details)
2 Months Ended 8 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, 2017
USD ($)
$ / shares
shares
Feb. 12, 2017
USD ($)
Dec. 31, 2016
$ / shares
Sep. 30, 2015
USD ($)
Aug. 20, 2014
USD ($)
$ / shares
Equity, Class of Treasury Stock [Line Items]                              
Authorized repurchase amount   $ 400,000,000   $ 400,000,000   $ 400,000,000           $ 500,000,000      
Authorized amount for accelerated stock repurchase program   $ 400,000,000   $ 400,000,000   $ 400,000,000                  
Accelerated shares repurchased (in 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          
Total shares acquired (in shares) | shares                     3,627,390        
Total shares acquired                     $ 221,428,000        
Average cost of shares acquired (in dollars per share) | $ / shares                     $ 61.01        
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
Commission percent to sales agent                             2.00%
PPR Portfolio | PPR Portfolio                              
Equity, Class of Treasury Stock [Line Items]                              
Ownership interest           40.00%                  
2015 Stock Buyback Program                              
Equity, Class of Treasury Stock [Line Items]                              
Authorized repurchase amount                           $ 1,200,000,000