SEGMENT REPORTING - Reconciliation of Company's Primary Measure of Segment Profitability (EBITDA) to Loss from Operations (Detail) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting [Abstract]
Total Reportable Segment Adjusted EBITDA				$ 577.8	$ 744.6	$ 812.0
Depreciation				(125.8)	(125.6)	(131.1)
Intangible Amortization				(145.2)	(130.3)	(118.4)
Business Transformation				(67.7)	(82.6)	(31.3)
Acquisition and Integration				(3.5)	(9.8)	(40.7)
Operational Optimization				(14.5)	(29.4)	(71.1)
Divestitures (including Divestiture Losses, net of Gains)				(114.7)	(20.5)	(9.5)
Litigation, Settlements and Regulatory Compliance				(28.2)	(93.2)	(327.7)
Asset Impairments				(22.1)	(26.5)
Impairments during the year	$ (207.4)	$ (20.9)	$ (358.7)	(228.3)	(358.7)	(65.0)
Other				(39.7)	(29.1)	(24.8)
(Loss) income from operations				$ (211.9)	$ (161.1)	$ (7.6)