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EMPLOYEE BENEFITS - Schedule of Asset Category (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2022
Pension and SERP
Defined Contribution Plan Disclosure [Line Items]
Fair value of pension plan assets	$ 5,775.0	$ 5,514.0	$ 5,806.4
Uncategorized	4,776.8	4,518.7
Pension and SERP | Total Assets Before 401
Defined Contribution Plan Disclosure [Line Items]
Fair value of pension plan assets	6,019.9	5,745.1
Pension and SERP | Equity Securities
Defined Contribution Plan Disclosure [Line Items]
Fair value of pension plan assets	1,227.0	1,149.6
Uncategorized	853.0	826.0
Pension and SERP | Fixed Income
Defined Contribution Plan Disclosure [Line Items]
Fair value of pension plan assets	2,211.9	1,988.6
Uncategorized	1,516.4	1,329.6
Pension and SERP | Private Equity
Defined Contribution Plan Disclosure [Line Items]
Fair value of pension plan assets	1,685.3	1,710.9
Uncategorized	1,685.3	1,710.9
Pension and SERP | Real Assets
Defined Contribution Plan Disclosure [Line Items]
Fair value of pension plan assets	895.7	896.0
Uncategorized	722.1	652.2
Pension and SERP | 401 PBOP Assets
Defined Contribution Plan Disclosure [Line Items]
Fair value of pension plan assets	(244.9)	(231.1)
Pension and SERP | Level 1
Defined Contribution Plan Disclosure [Line Items]
Fair value of pension plan assets	902.2	881.7
Pension and SERP | Level 1 | Equity Securities
Defined Contribution Plan Disclosure [Line Items]
Fair value of pension plan assets	374.0	323.6
Pension and SERP | Level 1 | Fixed Income
Defined Contribution Plan Disclosure [Line Items]
Fair value of pension plan assets	354.6	314.3
Pending redemption settlements	31.0
Pension and SERP | Level 1 | Private Equity
Defined Contribution Plan Disclosure [Line Items]
Fair value of pension plan assets	0.0	0.0
Pension and SERP | Level 1 | Real Assets
Defined Contribution Plan Disclosure [Line Items]
Fair value of pension plan assets	173.6	243.8
Pension and SERP | Level 2
Defined Contribution Plan Disclosure [Line Items]
Fair value of pension plan assets	340.9	344.7
Pension and SERP | Level 2 | Equity Securities
Defined Contribution Plan Disclosure [Line Items]
Fair value of pension plan assets	0.0	0.0
Pension and SERP | Level 2 | Fixed Income
Defined Contribution Plan Disclosure [Line Items]
Fair value of pension plan assets	340.9	344.7
Pension and SERP | Level 2 | Private Equity
Defined Contribution Plan Disclosure [Line Items]
Fair value of pension plan assets	0.0	0.0
Pension and SERP | Level 2 | Real Assets
Defined Contribution Plan Disclosure [Line Items]
Fair value of pension plan assets	0.0	0.0
PBOP
Defined Contribution Plan Disclosure [Line Items]
Fair value of pension plan assets	1,024.4	1,036.3	$ 970.1
Uncategorized	493.5	430.3
PBOP | Total Assets Before 401
Defined Contribution Plan Disclosure [Line Items]
Fair value of pension plan assets	779.5	805.2
PBOP | Equity Securities
Defined Contribution Plan Disclosure [Line Items]
Fair value of pension plan assets	351.2	351.1
Uncategorized	212.1	166.3
PBOP | Fixed Income
Defined Contribution Plan Disclosure [Line Items]
Fair value of pension plan assets	236.2	233.9
Uncategorized	159.8	127.5
PBOP | Private Equity
Defined Contribution Plan Disclosure [Line Items]
Fair value of pension plan assets	87.7	99.0
Uncategorized	87.7	99.0
PBOP | Real Assets
Defined Contribution Plan Disclosure [Line Items]
Fair value of pension plan assets	104.4	121.2
Uncategorized	33.9	37.5
PBOP | 401 PBOP Assets
Defined Contribution Plan Disclosure [Line Items]
Fair value of pension plan assets	244.9	231.1
PBOP | Level 1
Defined Contribution Plan Disclosure [Line Items]
Fair value of pension plan assets	243.0	330.3
PBOP | Level 1 | Equity Securities
Defined Contribution Plan Disclosure [Line Items]
Fair value of pension plan assets	139.1	184.8
PBOP | Level 1 | Fixed Income
Defined Contribution Plan Disclosure [Line Items]
Fair value of pension plan assets	33.4	61.8
PBOP | Level 1 | Private Equity
Defined Contribution Plan Disclosure [Line Items]
Fair value of pension plan assets	0.0	0.0
PBOP | Level 1 | Real Assets
Defined Contribution Plan Disclosure [Line Items]
Fair value of pension plan assets	70.5	83.7
PBOP | Level 2
Defined Contribution Plan Disclosure [Line Items]
Fair value of pension plan assets	43.0	44.6
PBOP | Level 2 | Equity Securities
Defined Contribution Plan Disclosure [Line Items]
Fair value of pension plan assets	0.0	0.0
PBOP | Level 2 | Fixed Income
Defined Contribution Plan Disclosure [Line Items]
Fair value of pension plan assets	43.0	44.6
PBOP | Level 2 | Private Equity
Defined Contribution Plan Disclosure [Line Items]
Fair value of pension plan assets	0.0	0.0
PBOP | Level 2 | Real Assets
Defined Contribution Plan Disclosure [Line Items]
Fair value of pension plan assets	$ 0.0	$ 0.0

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