SEGMENT REPORTING - Reconciliation of Company's Primary Measure of Segment Profitability Adjusted Income from Operations to Income (loss) from Operations (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting [Abstract]
Total Reportable Segment Adjusted Income from Operations	$ 101.0	$ 118.8	$ 280.1	$ 329.4
Business Transformation	(10.7)	(17.1)	(37.9)	(51.6)
Intangible Amortization	(31.4)	(35.8)	(94.5)	(110.5)
Acquisition and Integration	0.0	(1.6)	0.0	(3.5)
Operational Optimization	(3.1)	(3.9)	(3.1)	(11.1)
Divestitures (including Divestiture (losses) gains, net)	(105.4)	(85.3)	(172.9)	(87.4)
Litigation, Settlements and Regulatory Compliance	(3.5)	(2.4)	(12.1)	(21.3)
Goodwill Impairment	0.0	0.0	0.0	(20.9)
Asset Impairments	(0.6)	0.0	(12.9)	(3.7)
Other	(2.1)	(7.2)	(8.0)	(32.8)
Loss from operations	$ (55.8)	$ (34.5)	$ (61.3)	$ (13.4)