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SUPPLEMENTAL CASH FLOW INFORMATION - ADDITIONAL INFORMATION (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Supplemental cash flow information
Cash paid for interest, net of amount capitalized	$ 555.4	$ 533.1
Cash received for income taxes, net	(220.0)	(214.6)
Cash received from sale of production tax credits	195.0	217.1
Tax refund received from Wisconsin	25.0
Significant non-cash investing and financing transactions
Accounts payable related to construction costs	227.6	163.4
Common stock issued for stock-based compensation plans	3.2	6.4
Increase in receivables related to property damage insurance proceeds	2.5	5.3
Liabilities accrued for software licensing agreements	$ 20.7	$ 0.0

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

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