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OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES - Supplemental Statement of Cash Flows Information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash Paid for Interest – Net of Amounts Capitalized	$ 59.5	$ 64.8
Cash Paid for Income Taxes – Net	7.0	14.1
Noncash Investing and Financing Activities
Increase in Accounts Payable for Capital Additions to Property, Plant and Equipment	13.5	11.8
Capitalized Asset Retirement Costs	51.0	2.4
AFUDC–Equity	$ 4.0	$ 2.5

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- Definition

Increase (Decrease) In Accounts Payable For Capital Additions To Property, Plant And Equipment

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Amount, after refund, of cash paid to foreign, federal, state, and local jurisdictions as income tax.

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The increase (decrease) during the reporting period in the capitalized cost of equity (based on assumed rate of return) and / or borrowed funds (based on interest rate) used to finance construction of regulated assets, which is expected to be recovered through rate adjustments. As a result of this capitalization, net income is increased. This element pertains to certain regulated industries, such as public utilities.

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The increase (decrease) during the reporting period in the carrying amount of asset retirement obligations.

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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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