CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - $ / shares							9 Months Ended
	Nov. 06, 2018	Nov. 05, 2018	Jul. 27, 2018	Jun. 06, 2018	Apr. 20, 2018	Feb. 23, 2018	Sep. 30, 2018	Sep. 30, 2017
Dividend declared (in dollars per share)	$ 0.06		$ 0.06		$ 0.06	$ 0.06	$ 0.18	$ 0.18
Cash dividend per mandatory convertible preferred shares							$ 1.39
Mandatory Convertible Preferred Shares
Cash dividend per mandatory convertible preferred shares		$ 0.75	$ 0.75	$ 0.64