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DISCONTINUED OPERATIONS - Cash Flow and Non-Cash Information Related to Discontinued Operations (Details) - Discontinued Operations, Disposed of by Sale - ATC TIPL - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Capital expenditures	$ 0.0	$ (26.2)
Significant non-cash items:
Depreciation, amortization and accretion	0.0	40.6
Stock-based compensation expense	0.0	2.1
Impairments, net loss on sale of long-lived assets, non-cash restructuring and merger related expenses	0.0	(1.6)
Loss (gain) on investments, unrealized foreign currency loss (gain) and other non-cash expense	$ 0.0	$ 0.5

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- Definition

Disposal Group, Including Discontinued Operation, Gain (Loss) On Investments, Unrealized Foreign Currency Gain (loss) And Other Non-Cash Income (Expense)

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Disposal Group, Including Discontinued Operation, Impairments, Net Loss On Sale Of Long-lived Assets, Non-Cash Restructuring And Merger Related Expenses

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Amount of capital expenditure attributable to discontinued operations.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5B
-Subparagraph (c)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483499/205-20-50-5B

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Amount of deprecation and amortization expense attributable to property, plant and equipment and intangible assets of discontinued operations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5B
-Subparagraph (c)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483499/205-20-50-5B

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