Consolidated Statements of Shareholders' Equity (Parentheticals) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Stockholders' Equity [Abstract]
Common stock, dividends per share (in dollars per share)	$ 1.05	$ 1.05	$ 3.15	$ 3.10
Redeemable non-controlling interests, dividends per share (in dollars per share)	$ 15.00	$ 15.00	$ 45.00	$ 45.00