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Subsequent event - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
Aug. 24, 2016
Jul. 30, 2016
Jan. 30, 2016
Aug. 01, 2015
Subsequent Event [Line Items]        
Common shares, par value (usd per share)   $ 0.18 $ 0.18 $ 0.18
Subsequent Event        
Subsequent Event [Line Items]        
Common shares, par value (usd per share) $ 0.18      
Series A Preferred Stock | Subsequent Event        
Subsequent Event [Line Items]        
Preferred stock, par value (usd per share) $ 0.01      
Preferred stock, purchase price $ 625      
Shares issued, price per share $ 1,000      
Preferred stock, dividend rate, percentage 5.00%