EMPLOYEE BENEFITS - Schedule of Estimated Future Benefit Payments (Details) $ in Millions	Dec. 31, 2021 USD ($)
Pension Plan
Defined Contribution Plan Disclosure [Line Items]
2022	$ 359.6
2023	367.4
2024	405.0
2025	381.2
2026	384.3
2027 - 2031	1,918.2
Other Postretirement Benefits Plan
Defined Contribution Plan Disclosure [Line Items]
2022	56.4
2023	56.2
2024	55.9
2025	55.3
2026	54.3
2027 - 2031	$ 254.6

Amount of benefit for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following current fiscal year.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

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Amount of benefit for defined benefit plan expected to be paid in next fiscal year following current fiscal year.

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