BENEFIT PLANS (Combined Funded Status of Plans and their Reconciliation with Related Amounts Recognized in Consolidated Financial Statements - Pension Benefits) (Details) - Pension Plans, Defined Benefit [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Change in Benefit Obligation
Projected benefit obligation at beginning of year	$ 691.1	$ 915.4
Service cost	2.5	4.0	$ 4.8
Interest cost	34.0	21.1	19.7
Actuarial (gain) loss	12.4	(200.7)
Benefits paid	(46.7)	(48.7)
Projected benefit obligation at end of year	693.3	691.1	915.4
Change in Fair Value of Plan Assets
Fair value of assets at beginning of year	637.8	860.5
Actual return on plan assets	49.4	(181.8)
Employer contributions	7.4	7.8	8.0
Benefits paid	(46.7)	(48.7)
Fair value of assets at end of year	647.9	637.8	$ 860.5
Funded status	(45.4)	(53.3)
Amounts Recognized in the Consolidated Balance Sheets
Noncurrent assets	6.5	0.0
Current liabilities	(7.3)	(7.8)
Noncurrent liabilities	(44.6)	(45.5)
Net amount recognized	(45.4)	(53.3)
Amounts Recognized in Accumulated Other Comprehensive Income
Net actuarial loss	168.4	183.4
Prior service cost	1.0	2.4
Total amount recognized	$ 169.4	$ 185.8