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SUPPLEMENTAL CASH FLOW INFORMATION - SUPPLEMENTAL INFORMATION (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021
Supplemental cash flow information |  |
Cash paid for interest, net of amount capitalized | $ 311.4 | $ 310.9
Cash paid for income taxes, net | 52.3 | 33.8
Significant non-cash investing and financing transactions: |  |
Accounts payable related to construction costs | 170.9 | 144.0
Accounts payable related to Thunderhead acquisition milestone payments | 19.0 | 0.0
Increase in receivable related to insurance proceeds | 0.0 | 58.3
Liabilities accrued for software licensing agreement | $ 7.4 | $ 0.0

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