OTHER COMPREHENSIVE INCOME (Changes in Accumulated Other Comprehensive Income, Net of Tax) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning balance	$ (152.7)
Amounts reclassified from AOCI	1.1
Net current period OCI changes	1.1	$ 1.6
AOCI, Ending balance	(151.6)	$ (179.7)
Amortization of Interest Rate Hedges Losses [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning balance	(22.5)
Amounts reclassified from AOCI	0.4
Net current period OCI changes	0.4
AOCI, Ending balance	(22.1)
Amortization of Pension and Postretirement Plan Actuarial Loss and Prior Service Cost [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI, Beginning balance	(130.2)
Amounts reclassified from AOCI	0.7
Net current period OCI changes	0.7
AOCI, Ending balance	$ (129.5)