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Consolidated Statement of Changes in Equity (Parenthetical) - $ / shares
12 Months Ended
Jul. 13, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Restatement [abstract]        
Dividends declared and paid, per share $ 0.90 $ 2.21 $ 0.90 $ 0.85