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Subsequent events (Details) - USD ($)
$ / shares in Units, $ in Millions
Feb. 07, 2019
Feb. 20, 2019
Dividend    
Disclosure of non-adjusting events after reporting period [line items]    
Dividends proposed (per share) $ 2.64  
Major business combination    
Disclosure of non-adjusting events after reporting period [line items]    
Acquisition price   $ 1,650