OTHER COMPREHENSIVE INCOME (Changes in Accumulated Other Comprehensive Income, Net of Tax) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2023 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning balance	$ (154.7)
Amounts reclassified from AOCI	3.3
Net current period OCI changes	3.3
AOCI, Ending balance	(151.4)
Amortization Of Cash Flow Hedge Losses [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning balance	(21.0)
Amounts reclassified from AOCI	0.8
Net current period OCI changes	0.8
AOCI, Ending balance	(20.2)
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	2.5
Net current period OCI changes	2.5
AOCI, Ending balance	$ (131.2)