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SUPPLEMENTAL CASH FLOW INFORMATION - ADDITIONAL INFORMATION (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2026 | Jun. 30, 2025
Supplemental cash flow information |  |
Cash paid for interest, net of amount capitalized | $ 443.9 | $ 429.2
Significant non-cash investing and financing transactions |  |
Accounts payable related to construction costs | 245.4 | 153.9
Common stock issued for stock-based compensation plans | 4.2 | 3.2
Liabilities accrued for software licensing agreements | 2.6 | 20.7
Decrease in receivables related to property damage insurance proceeds | $ 0.0 | $ (1.4)

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