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Supplemental Equity and Comprehensive Income Information - Dividends (Details) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Supplemental Equity and Comprehensive Income Information            
Dividends declared in current period (in dollars per share) $ 1.47 $ 1.47 $ 1.44 $ 1.44 $ 2.94 $ 2.88