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Condensed Consolidated and Combined Statements of Changes in Equity (Unaudited) (Parenthetical) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Common Class A | Cash Dividend      
Cash dividends per share (in dollars per share) $ 0.18 $ 0.36