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, 2021	Dec. 31, 2020	Dec. 31, 2019
Change in Benefit Obligation
Projected benefit obligation at beginning of year	$ 1,059.5	$ 1,090.9
Service cost	4.8	4.9	$ 5.0
Interest cost	19.7	29.3	37.6
Actuarial (loss) gain	(25.0)	89.1
Benefits paid	(56.4)	(154.7)
Annuity purchase	(87.2)	(0.0)
Projected benefit obligation at end of year	915.4	1,059.5	1,090.9
Change in Fair Value of Plan Assets
Fair value of assets at beginning of year	944.2	949.0
Actual return on plan assets	51.9	141.1
Employer contributions	8.0	8.8	8.9
Benefits paid	(56.4)	(154.7)
Annuity purchase	(87.2)	(0.0)
Fair value of assets at end of year	860.5	944.2	$ 949.0
Funded status	(54.9)	(115.3)
Amounts Recognized in the Consolidated Balance Sheets
Noncurrent assets	18.2	0.0
Current liabilities	(8.2)	(8.1)
Noncurrent liabilities	(64.9)	(107.2)
Net amount recognized	(54.9)	(115.3)
Amounts Recognized in Accumulated Other Comprehensive Income
Net actuarial loss	176.4	230.5
Prior service cost	3.8	5.1
Total amount recognized	$ 180.2	$ 235.6