CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) $ in Millions	Jun. 30, 2019 USD ($)
Series I
Cumulative dividends	$ 0.3

Amount of cumulative cash dividends distributed to shareholders.

No definition available.

Name:	us-gaap_CumulativeDividends
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant