ACCOUNTS PAYABLE AND ACCRUED LIABILITIES - Narrative (Details) - Heartland $ in Millions	12 Months Ended
Dec. 31, 2019 USD ($)
Business Acquisition [Line Items]
Share-based compensation expense associated with equity awards held by terminated employees	$ 57.1
Asset write-offs	17.3
Employee termination benefits obligations	$ 37.3

Amount of noncash expense (reversal of expense) for employee benefits and share-based payment arrangement. Includes, but is not limited to, pension, other postretirement, postemployment and termination benefits.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration