OTHER COMPREHENSIVE INCOME (Changes in Accumulated Other Comprehensive Income, Net of Tax) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning balance	$ (154.7)
Amounts reclassified from AOCI	5.0
Net current period OCI changes	5.0
AOCI, Ending balance	(149.7)
Amortization Of Cash Flow Hedge Losses [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning balance	(21.0)
Amounts reclassified from AOCI	1.2
Net current period OCI changes	1.2
AOCI, Ending balance	(19.8)
Amortization Of Pension And Postretirement Plan Actuarial Loss And Prior Service Cost [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning balance	(133.7)
Amounts reclassified from AOCI	3.8
Net current period OCI changes	3.8
AOCI, Ending balance	$ (129.9)