CONSOLIDATED STATEMENTS OF EQUITY AND REDEEMABLE NONCONTROLLING INTERESTS (Parenthetical) - $ / shares	1 Months Ended								12 Months Ended
	Nov. 30, 2019	Aug. 31, 2019	May 31, 2019	Feb. 28, 2019	Nov. 30, 2018	Aug. 31, 2018	May 31, 2018	Feb. 28, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Dividends declared per share (in dollars per share)	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.18	$ 0.18	$ 0.18
Dividends paid per share (in dollars per share)									$ 0.80	$ 0.74
Class A Common Stock
Dividends declared per share (in dollars per share)									0.8	0.74	$ 0.72
Dividends paid per share (in dollars per share)									0.8	0.74	0.72
Class B Common Stock
Dividends declared per share (in dollars per share)									0.8	0.74	0.72
Dividends paid per share (in dollars per share)									$ 0.8	$ 0.74	$ 0.72