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Equity (Details) - USD ($)
$ / shares in Units, shares in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
Dividends Payable [Line Items]            
Common Stock, Dividends, Per Share, Cash Paid [1] $ 0.885 $ 0.885 $ 0.885      
Dividends, Common Stock, Cash [1] $ 300,300,000 $ 300,800,000 $ 300,000,000      
Common stock repurchased during period, shares         0.3  
Purchases of capital stock         $ 24,759,000 $ 29,576,000
Common Stock [Member]            
Dividends Payable [Line Items]            
Dividends Payable, Date Declared [1] Aug. 02, 2016 May 20, 2016 Feb. 18, 2016      
Dividends Payable, Date to be Paid [1] Sep. 30, 2016 Jun. 30, 2016 Mar. 31, 2016      
Dividends Payable, Date of Record [1] Sep. 16, 2016 Jun. 17, 2016 Mar. 18, 2016      
Mandatory Convertible Preferred stock [Member]            
Dividends Payable [Line Items]            
Dividends Payable, Date Declared     Mar. 22, 2016 Dec. 16, 2015    
Dividends Payable, Date to be Paid     May 02, 2016 Feb. 01, 2016    
Dividends Payable, Date of Record     Apr. 15, 2016 Jan. 16, 2016    
Preferred Stock, Dividends, Per Share, Cash Paid   $ 1.1250 $ 1.1250 $ 1.1250    
Dividends, Preferred Stock, Cash   $ 11,000,000 $ 11,000,000 $ 11,000,000    
Mandatory Convertible Preferred stock [Member] | Paid subsequent to quarter end [Member]            
Dividends Payable [Line Items]            
Dividends Payable, Date Declared Sep. 17, 2016 [2] Jun. 28, 2016        
Dividends Payable, Date to be Paid Nov. 01, 2016 [2] Aug. 01, 2016        
Dividends Payable, Date of Record Oct. 15, 2016 [2] Jul. 15, 2016        
Preferred Stock, Dividends, Per Share, Cash Paid [2] $ 1.1250          
Dividends, Preferred Stock, Cash [2] $ 11,000,000          
[1] Inclusive of dividends accrued for holders of unvested restricted stock units and payments of previously accrued dividends for holders of restricted stock units that have vested during the nine months ended September 30, 2016.
[2] .