CREDIT FACILITIES AND DEBT (Summary of Long-Term Debt) (Details) - USD ($) $ in Millions		Sep. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 1,301.6	$ 1,470.1
Current debt		0.0	0.0
Unamortized discount		(3.3)	0.0
Unamortized deferred financing costs		(55.3)	(35.2)
Long-term debt		1,243.0	1,434.9
Revolving Credit Facility
Debt Instrument [Line Items]
Long-term Line of Credit		0.0	0.0
2028 Senior Notes
Debt Instrument [Line Items]
Long-term Debt	[1]	801.6	801.6
2025 Senior Notes
Debt Instrument [Line Items]
Long-term Debt	[1]	0.0	664.5
Catalyst financing arrangements
Debt Instrument [Line Items]
Long-term Debt	[2]	0.0	4.0
2030 Senior Notes
Debt Instrument [Line Items]
Long-term Debt	[1]	$ 500.0	$ 0.0

[1] The estimated fair value, categorized as a Level 2 measurement, was calculated based on the present value of future expected payments utilizing implied current market interest rates based on quoted prices of the outstanding senior notes.

[2] Catalyst financing arrangements were valued using a market approach based upon commodity prices for similar instruments quoted in active markets and were categorized as a Level 2 measurement. The Company elected the fair value option for accounting for its catalyst repurchase obligations as the Company’s liability was directly impacted by the change in fair value of the underlying catalyst.