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SUPPLEMENTAL CASH FLOW INFORMATION - SUPPLEMENTAL INFORMATION (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Supplemental cash flow information
Cash paid for interest, net of amount capitalized				$ 332.4	$ 317.9
Cash paid for income taxes, net				27.6	15.4
Significant non-cash investing and financing transactions
Accounts payable related to construction costs				177.8	162.7
Non-cash capital contributions from noncontrolling interest	$ 4.3	$ 5.5	$ 4.8	$ 0.0	$ 14.6

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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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