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DEBT (Tables)
 9 Months Ended
Sep. 30, 2024
Debt Disclosure [Abstract]  
Schedule of Convertible Notes and Components of Interest Expense The following table is a summary of the 2026 Notes as of September 30, 2024 and December 31, 2023 (in millions):
September 30, 2024December 31, 2023
Principal Amount$2,012.5 $2,012.5 
Unamortized Debt Discounts and Issuance Costs(11.7)(15.5)
Net Carrying Amount $2,000.8 $1,997.0 
Fair Value (Level 2)$1,363.5 $1,061.6 
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,
2024202320242023
Contractual interest$6.4 $6.3 $19.0 $18.9 
Amortization of debt discounts and debt issuance costs1.3 1.3 3.8 3.9 
Interest expense$7.7 $7.6 $22.8 $22.8