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DISCONTINUED OPERATIONS - Cash Flow and Non-Cash Information Related to Discontinued Operations (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 12, 2024
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from the sale of ATC TIPL       $ 0.0 $ 2,158.8
Significant non-cash items:          
Loss on sale of ATC TIPL       0.0 1,245.5
Discontinued Operations, Disposed of by Sale | ATC TIPL          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from the sale of ATC TIPL       0.0 2,158.8
Capital expenditures       0.0 (52.3)
Significant non-cash items:          
Depreciation, amortization and accretion       0.0 96.0
Stock-based compensation expense     $ 6.8 0.0 10.9
Impairments, net loss on sale of long-lived assets, non-cash restructuring and merger related expenses       0.0 (2.3)
(Gain) loss on investments, unrealized foreign currency loss (gain) and other non-cash expense       0.0 (30.7)
Loss on sale of ATC TIPL   $ 0.0 1,245.5 $ 0.0 1,245.5
Reclassification of cumulative translation adjustment $ 1,100.0   $ 1,100.0   $ 1,072.3