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CREDIT FACILITIES AND DEBT (Tables)
 6 Months Ended
Jun. 30, 2023
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments Debt outstanding consists of the following:
(in millions)June 30, 2023December 31, 2022
2028 Senior Notes$801.6 $801.6 
2025 Senior Notes664.5 664.5 
Revolving Credit Facility— — 
Catalyst financing arrangements 2.7 4.0 
1,468.8 1,470.1 
Unamortized premium — — 
Unamortized deferred financing costs(27.3)(35.2)
Long-term debt$1,441.5 $1,434.9