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SUPPLEMENTAL CASH FLOW INFORMATION - SUPPLEMENTAL INFORMATION (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Supplemental cash flow information
Cash paid for interest, net of amount capitalized	$ 432.9	$ 311.4
Cash paid for income taxes, net	15.8	52.3
Significant non-cash investing and financing transactions:
Accounts payable related to construction costs	236.5	170.9
Accounts payable related to Thunderhead acquisition milestone payments	0.0	19.0
Increase in receivables related to insurance proceeds	6.2	0.0
Liabilities accrued for software licensing agreement	$ 0.0	$ 7.4

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

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Future cash outflow to pay for a software licensing agreement

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