SUPPLEMENTAL CASH FLOW INFORMATION (Tables)

6 Months Ended

Jun. 30, 2025

Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract]

Schedule of supplemental cash flow information

	Six Months Ended June 30
(in millions)	2025		2024
Cash paid for interest, net of amount capitalized	$	429.2	$	377.7
Cash received for income taxes, net (1) (2)	(133.2)		(172.8)
Significant non-cash investing and financing transactions:
Accounts payable related to construction costs	153.9		167.1
Common stock issued for stock-based compensation plans	3.2		6.4
Increase (decrease) in receivables related to property damage insurance proceeds	(1.4)		2.2
Liabilities accrued for software licensing agreements	20.7		—

(1)    Cash received for income taxes in 2025 and 2024 includes $113.0 million related to 2024 and 2025 PTCs and $173.0 million related to 2023 and 2024 PTCs, respectively, that were sold to third parties.

(2)    Cash received for income taxes in 2025 includes a $25.0 million tax refund received in Wisconsin.

Reconciliation of cash, cash equivalents, and restricted cash

The following table reconciles the cash, cash equivalents, and restricted cash amounts reported within the balance sheets to the total of these amounts shown on the statements of cash flows:

(in millions)	June 30, 2025		December 31, 2024
Cash and cash equivalents	$	23.0	$	9.8
Restricted cash included in other current assets	11.7		5.3
Restricted cash included in other long-term assets	34.5		27.1
Cash, cash equivalents, and restricted cash	$	69.2	$	42.2