OTHER COMPREHENSIVE INCOME - Changes in Accumulated Other Comprehensive Income, Net of Tax (Details) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	$ 7,507.9
Balance at end of period	7,516.6
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(143.8)
Amounts reclassified from AOCI	1.7
Net current period OCI changes	1.7
Balance at end of period	(142.1)
Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(19.4)
Amounts reclassified from AOCI	0.4
Net current period OCI changes	0.4
Balance at end of period	(19.0)
Pension and Postretirement Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(124.4)
Amounts reclassified from AOCI	1.3
Net current period OCI changes	1.3
Balance at end of period	$ (123.1)