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SUPPLEMENTAL CASH FLOW INFORMATION - SUPPLEMENTAL INFORMATION (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Supplemental cash flow information
Cash paid for interest, net of amount capitalized	$ 533.1	$ 432.9
Cash paid (received) for income taxes, net	(214.6)	15.8
Cash received from sale of production tax credits	217.1
Significant non-cash investing and financing transactions
Accounts payable related to construction costs	163.4	236.5
Common stock issued for stock-based compensation plans	6.4	0.0
Increase in receivables related to insurance proceeds	$ 5.3	$ 6.2

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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Increase in the receivables related to insurance proceeds considered to be a noncash investing or financing activity.

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