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Unaudited Condensed Consolidated Statements of Shareholders' Investment (Parenthetical) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Statement of Stockholders' Equity [Abstract]            
Dividends declared (in dollars per share) $ 0.115 $ 0.115 $ 0.110 $ 0.110 $ 0.230 $ 0.220