Condensed Consolidated Statement of Equity (Unaudited) (Parenthetical) - $ / shares
3 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dividends to:            
Dividends (dollars per share) $ 0.15 $ 0.15 $ 0.15 $ 0.15 $ 0.15 $ 0.1