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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Oct. 12, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Nov. 01, 2017
Subsequent Event [Line Items]            
Dividends declared per share (in US dollars per share)   $ 0.47 $ 0.43 $ 1.41 $ 1.30  
Subsequent Event            
Subsequent Event [Line Items]            
Dividends declared per share (in US dollars per share) $ 0.47          
Assets Of One Of CEC Entities | Subsequent Event            
Subsequent Event [Line Items]            
Sale price           $ 5