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DISCONTINUED OPERATIONS - Loss on Sale of Discontinued Operations (Details) $ in Millions, ₨ in Billions		3 Months Ended		9 Months Ended
	Sep. 12, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 12, 2024 INR (₨)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total loss on sale included in loss from discontinued operations, net of taxes				$ 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 received at closing	$ 2,200.0		$ 2,158.8		2,158.8	₨ 182
Net assets at closing			(2,257.6)		(2,257.6)
Loss on sale					(98.8)
Deal costs					(20.5)
Contingent liability for tax indemnification			(53.9)		(53.9)
Reclassification of cumulative translation adjustment	$ (1,100.0)		(1,100.0)		(1,072.3)
Total loss on sale included in loss from discontinued operations, net of taxes		$ 0.0	$ (1,245.5)	$ 0.0	$ (1,245.5)

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Amount after tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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