SEGMENT REPORTING - Reconciliation of Segment Profitability to Income from Operations (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting [Abstract]
Total Reportable Segment Adjusted Income from Operations	$ 81.5	$ 76.0	$ 172.0	$ 160.7
ERP and System Modernization	(4.2)	(5.4)	(8.6)	(8.1)
Intangible Amortization	(27.7)	(28.1)	(55.5)	(56.3)
Operational Optimization	0.2	0.0	(5.4)	0.0
Portfolio Optimization	(0.2)	(54.2)	(1.8)	(59.8)
Litigation, Settlements and Regulatory Compliance	(10.9)	(8.9)	(23.1)	(17.1)
Asset Impairments	0.0	(3.4)	0.0	(3.4)
WM Transaction-Related Charges	(8.2)	0.0	(8.2)	0.0
Income (loss) from operations	$ 30.5	$ (24.0)	$ 69.4	$ 16.0

Adjusted Operating Income (Loss)

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- Definition

Enterprise Resource Planning System Implementation Costs

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No definition available.

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- Definition

Litigation settlement and regulatory compliance.

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- Definition

Amount of expenses associated with operational optimization.

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No definition available.

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- Definition

Portfolio Optimization Charges

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No definition available.

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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- Definition

The net result for the period of deducting operating expenses from operating revenues.

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