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SUPPLEMENTAL CASH FLOW INFORMATION - SUPPLEMENTAL INFORMATION (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023
Supplemental cash flow information |  |
Cash paid for interest, net of amount capitalized | $ 377.7 | $ 312.8
Cash paid (received) for income taxes, net | (172.8) | 15.8
Cash received from sale of production tax credits | 173.0 |
Significant non-cash investing and financing transactions |  |
Accounts payable related to construction costs | 167.1 | 156.7
Common stock issued for stock-based compensation plans | 6.4 | 0.0
Increase in receivables related to insurance proceeds | $ 2.2 | $ 5.6

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