SEGMENT REPORTING - Reconciliation of Segment Profitability to Income from Operations (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	9 Months Ended
Feb. 29, 2024	Oct. 31, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting [Abstract]
Total Reportable Segment Adjusted Income from Operations			$ 71.4	$ 70.3	$ 243.4	$ 231.0
ERP and System Modernization			(4.1)	(4.8)	(12.7)	(12.9)
Intangible Amortization			(27.6)	(27.9)	(83.1)	(84.2)
Operational Optimization	$ (5.4)	$ (3.0)	0.4	0.0	(5.0)	0.0
Portfolio Optimization			(11.8)	(5.0)	(13.6)	(64.8)
Litigation, Settlements and Regulatory Compliance			(15.9)	(5.3)	(39.0)	(22.4)
Asset Impairments			0.0	(3.1)	0.0	(6.5)
WM Transaction-Related Charges			(3.4)	0.0	(11.6)	0.0
Income from operations			$ 9.0	$ 24.2	$ 78.4	$ 40.2

Adjusted Operating Income (Loss)

No definition available.

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- Definition

Enterprise Resource Planning System Implementation Costs

+ References

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.

+ References

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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