BASIS OF PRESENTATION (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
Mar. 31, 2021	Jan. 31, 2021	Mar. 31, 2021	Mar. 31, 2020
Accounting Policies [Abstract]
Deferred contribution payments	$ 20.9		$ 0.4
Company contributions	$ 45.6	$ 23.1	$ 24.0	$ 0.4

Amount of cash outflow for pension and other postretirement benefits. Includes, but is not limited to, employer contribution to fund plan asset and payment to retiree.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3536-108585

Name:	us-gaap_PensionAndOtherPostretirementBenefitContributions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration