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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Capital expenditures |  | $ 0.0 | $ (44.3)
Significant non-cash items: |  |  |
Depreciation, amortization and accretion |  | 0.0 | 81.7
Stock-based compensation expense | $ 2.0 | 0.0 | 4.1
Impairments, net loss on sale of long-lived assets, non-cash restructuring and merger related expenses |  | 0.0 | (3.0)
Loss (gain) on investments, unrealized foreign currency loss (gain) and other non-cash expense |  | $ 0.0 | $ (44.0)

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