Consolidated Statements of Shareholders' Equity (Parentheticals) - $ / shares	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Stockholders' Equity [Abstract]
Common stock, dividends per share (in dollars per share)	$ 1.05	$ 1.00
Redeemable non-controlling interests, dividends per share (in dollars per share)	$ 15.00	$ 15.00