LEGAL MATTERS (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Legal matters
Professional service fees relating to our construction litigation	$ 0.5	$ 0.2	$ 0.8	$ 0.2
PCL Construction Services, Inc.
Legal matters
Professional service fees relating to our construction litigation	$ 0.5		$ 0.8

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration