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CREDIT FACILITIES AND DEBT (Tables)
 9 Months Ended
Sep. 30, 2023
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments Debt outstanding consists of the following:
(in millions)September 30, 2023December 31, 2022
2028 Senior Notes$801.6 $801.6 
2030 Senior Notes500.0 — 
2025 Senior Notes— 664.5 
Revolving Credit Facility— — 
Catalyst financing arrangements — 4.0 
1,301.6 1,470.1 
Less — Current debt— — 
Unamortized discount(3.3)— 
Unamortized deferred financing costs(55.3)(35.2)
Long-term debt$1,243.0 $1,434.9