CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - $ / shares						12 Months Ended
Nov. 06, 2018	Jul. 27, 2018	Jun. 06, 2018	Apr. 20, 2018	Feb. 23, 2018	Dec. 31, 2018	Dec. 31, 2016
Dividend declared (in dollars per share)	$ 0.06	$ 0.06		$ 0.06	$ 0.06	$ 0.24	$ 0.24
Mandatory Convertible Preferred Shares
Cash dividend per mandatory convertible preferred shares	$ 0.75	$ 0.75	$ 0.64			$ 2.14

Aggregate dividends declared during the period for each share of common stock outstanding.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Name:	us-gaap_CommonStockDividendsPerShareDeclared
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration