DERIVATIVE FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Details)	9 Months Ended
	Sep. 30, 2022 USD ($) Bcf	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($) Bcf
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative, Nonmonetary Notional Amount | Bcf	17.4		13.2
Premiums recorded in other current assets on natural gas contracts held	$ 27,100,000		$ 9,500,000
Fair Value Assets, Transfers between Levels	0	$ 0
Corporate bonds in other assets	7,100,000		6,900,000
Treasury notes in other assets	2,400,000		3,500,000
Long-term Debt	2,700,000,000		3,700,000,000
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value, natural gas call options	3,500,000		2,300,000
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Long-term Debt, Fair Value	$ 2,400,000,000		$ 3,900,000,000