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DEBT (Tables)
 9 Months Ended
Sep. 30, 2023
Debt Disclosure [Abstract]  
Schedule of Convertible Notes and Interest Expense The following table is a summary of the 2026 Notes as of September 30, 2023 and December 31, 2022 (in millions):
September 30, 2023December 31, 2022
Principal Amount$2,012.5 $2,012.5 
Unamortized Debt Discounts and Issuance Costs(16.8)(20.7)
Net Carrying Amount $1,995.7 $1,991.8 
Fair Value (Level 2)$1,217.6 $1,041.5 
The components of interest expense related to the 2026 Notes were as follows (in millions):
Three Months Ended September 30,Nine Months Ended September 30
2023202220232022
Contractual interest$6.3 $6.2 $18.9 $18.9 
Amortization of debt discounts and debt issuance costs1.3 1.4 3.9 3.8 
Interest expense$7.6 $7.6 $22.8 $22.7