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SUPPLEMENTAL CASH FLOW INFORMATION - ADDITIONAL INFORMATION (Details) - USD ($) $ in Millions | 9 Months Ended
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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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