Consolidated Statements of Shareholders' Equity (Parentheticals) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Stockholders' Equity [Abstract]
Common stock, dividends per share (in dollars per share)	$ 1.05	$ 1.05	$ 2.10	$ 2.05
Redeemable non-controlling interests, dividends per share (in dollars per share)	$ 15.00	$ 15.00	$ 30.00	$ 30.00