SEGMENT REPORTING - Reconciliation of Company's Primary Measure of Segment Profitability Adjusted Income from Operations to Income from Operations (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting [Abstract]
Total Reportable Segment Adjusted Income from Operations	$ 76.0	$ 82.0	$ 160.7	$ 141.0
ERP and System Modernization	(5.4)	(3.5)	(8.1)	(9.1)
Intangible Amortization	(28.1)	(30.8)	(56.3)	(63.2)
Portfolio Optimization	(54.2)	0.0	(59.8)	(1.3)
Litigation, Settlements and Regulatory Compliance	(8.9)	(9.6)	(17.1)	(23.4)
Asset Impairments	(3.4)	0.0	(3.4)	0.0
(Loss) income from operations	$ (24.0)	$ 38.1	$ 16.0	$ 44.0