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DISCONTINUED OPERATIONS - Components of Loss From 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]          
Loss on sale of ATC TIPL       $ 0.0 $ (1,245.5)
Loss from discontinued operations, net of taxes   $ 0.0 $ (1,208.5) 0.0 (978.3)
Discontinued Operations, Disposed of by Sale | ATC TIPL          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Revenue   0.0 234.1 0.0 911.2
Cost of operations   0.0 (131.8) 0.0 (473.8)
Depreciation, amortization and accretion   0.0 (14.3) 0.0 (96.0)
Selling, general, administrative and development expense   0.0 (30.0) 0.0 (58.7)
Other operating expense   0.0 (5.7) 0.0 (6.7)
Loss on sale of ATC TIPL   0.0 (1,245.5) 0.0 (1,245.5)
Operating loss   0.0 (1,193.2) 0.0 (969.5)
Interest income   0.0 4.4 0.0 30.7
Interest expense   0.0 (2.0) 0.0 (7.6)
Other income, net   0.0 0.2 0.0 46.5
Loss from discontinued operations before taxes   0.0 (1,190.6) 0.0 (899.9)
Income tax provision   0.0 (17.9) 0.0 (78.4)
Loss from discontinued operations, net of taxes   $ 0.0 (1,208.5) $ 0.0 (978.3)
Reclassification of cumulative translation adjustment $ 1,100.0   $ 1,100.0   $ 1,072.3